At least three policemen were killed and 16 others injured in a roadside bomb explosion in Pakistan's southwestern Balochistan province on Tuesday, officials said.

The incident took place near the Kund Masuri area of Mastung district, where a police truck carrying personnel from a training centre in Kalat district was hit by an Improvised Explosive Device (IED), revealed Shahid Rind, spokesperson for the Balochistan government.

"The condition of two injured is critical," Rind said.

He added that all the injured have been shifted to local hospitals, while those in serious condition are being transferred to Quetta for advanced medical treatment.

South Korea and the United States on Tuesday staged joint air drills, involving at least one US B-1B bomber, over the Korean Peninsula, the defence ministry said, in a show of force against North Korean military threats.

The drills, which also mobilised South Korean F-35A and F-16 fighter jets and US F-16s, were designed to demonstrate the allies' capabilities to respond to North Korea's advancing nuclear and missile threats, according to the ministry.

The drills coincided with the 113th birth anniversary of North Korea's late state founder Kim Il-sung, a major national holiday in the North, called the "Day of the Sun."

"In order to deter and respond to North Korea's threats, South Korea and the US will continue to expand combined exercises and strengthen the level of cooperation of the South Korea-US alliance," the ministry said.

A total of 123 civilians have been killed and 247 others injured, mostly women and children, since the US military resumed airstrikes across Yemen in mid-March, Houthi-run health authorities said in an statement.

The statement was issued following US airstrikes against a ceramic factory on the western outskirts of Yemen's capital Sanaa late on Sunday night, which killed seven people and injured 29 others.

The health authorities' previous statement on April 9 put the death toll from the renewed US air raids at 107 and the number of injuries at 223.

The Houthi group rarely discloses casualties among its fighters. However, the US military has repeatedly said the strikes have killed dozens of Houthi leaders, which the group has denied, news agency reported.

Rescue workers continued their search for a fifth day Tuesday to find a worker missing in the collapse of a subway construction site in the city of Gwangmyeong.

The construction site for the Sinansan Line collapsed Friday, causing a section of the road above ground to cave in and damaging several buildings, news agency reported.

All but one worker in his 50s were found safe or rescued.

The search for the missing person continued overnight with 95 personnel and 31 pieces of equipment, including four fire trucks fitted with smoke extraction devices and lamps, according to the Gyeonggi Fire Service.

The US dollar fell 0.7 per cent on Monday -- marking its fifth day of decline in a row. It pushed the DXY index, which measures the dollar’s strength against a group of major currencies, to its lowest level in three years.

Since the start of April, when US President Donald Trump declared ‘Liberation Day’ while unveiling his aggressive tariff policies, the dollar index has fallen more than four per cent.

This decline comes as investors begin to lose confidence in the strength of the US economy and pull out their money from American assets.

President Trump addressed these concerns last week, saying that the US dollar would always remain ‘the currency of choice.’

He added that if any country tried to move away from using the dollar, a single phone call would be enough to bring them back.

Two Air Force unit commanders of South Korea have been booked in relation to an unprecedented mistaken bombing on a civilian town last month, officials said on Monday, as the ministry released the interim probe results of the fighter jet accident.

On March 6, two KF-16 fighter jets dropped eight MK-82 bombs outside a training range in Pocheon, some 40 kilometres north of Seoul, during live-fire drills, injuring 52 people, including 38 civilians, according to an estimate by city authorities.

The two pilots, who are alleged to have erroneously entered the target coordinates prior to the live-fire drills, have been booked on charges of professional negligence resulting in injury and damaging military facilities. The pilots have also been suspended from air duty for one year.

"The ministry plans to refer the two pilots and the unit commanders who have been booked to the military prosecution after the probe concludes and seek disciplinary action against nine officials who were found to have belatedly reported the case and taken insufficient measures," the ministry's criminal investigation command said in a release.

Former South Korean President Yoon Suk Yeol defended himself during his first criminal trial on insurrection charges on Monday, saying his attempt to impose martial law in December did not amount to an insurrection.

Yoon arrived at the Seoul Central District Court in a black security vehicle and entered via the underground parking to avoid public exposure.

The first hearing got underway shortly before 10 am, with Yoon seated in the defendant's seat in a navy suit. Photography and filming by the Press were not allowed under a court order.

Yoon, a former top prosecutor, faces charges of leading an insurrection through his brief imposition of martial law on December 3 that saw the deployment of troops to the National Assembly in an alleged attempt to stop lawmakers from voting down the decree.

Supporters and opponents of South Korea's former President Yoon Suk Yeol on Monday gathered in front of the Seoul Central District Court in time for his arrival there to attend his first criminal trial related to his martial law declaration last year.

About 20 supporters of Yoon began to wave the South Korean and US flags in front of the court's main gate from 9 am, chanting slogans such as "Yoon Again." Some of them shouted, "The president is not guilty."

On the street across from the court's gate, a banner was hung that praises the presiding judge of Yoon's trial, news agency reported.

A Punjab-born surgeon, her two children and their partners were killed along with her husband, who piloted a small plane that crashed in New York state.

Joy Saini's family confirmed their deaths in a statement to the media on Sunday.

National Transportation Safety Board investigator Albert Nixon said on Sunday that the crash happened on Saturday while their Mitsubishi MU2B aircraft was trying to land at the Columbia County Airport, about 200 km from New York City.

Speaking at a news conference in Albany, he said that the pilot missed the approach for landing and asked to make another try, but the air traffic controller noticed it was flying at a low altitude and unsuccessfully tried to alert the pilot.

The plane, which had taken off from Westchester Airport in a New York City suburb, went down about ten miles from the airport near the border with Massachusetts State.

The Israel Defense Forces (IDF) announced in a statement on Saturday that it had completed the encirclement of the southern Gaza Strip city of Rafah.

According to the statement, an IDF armoured division carried out the encirclement by completing the establishment of the 'Morag Corridor', a route in southern Gaza intended to separate Rafah and Khan Younis.

It said that during operations in the past week and a half, IDF troops killed dozens of militants and dismantled Hamas military infrastructure, including underground tunnel routes.

The IDF noted that it will extend operational control over the 'Morag Corridor' and carry out 'counter-terrorism' operations in the area.

Later on Saturday, the IDF said its Air Force intercepted three rockets fired from Gaza towards southern Israel.