A special investigation team (SIT) of the Gurugram police has arrested five people, including a Haryana Police Assistant Sub-Inspector and a contractual worker of Delhi's Tehsil office, for usurping an NRI's land in Gurugram worth Rs 40 crore, police said on Wednesday. The accused, in a planned manner, had taken over the land of the NRI in their name by pretending to buy the land worth about Rs 40 crore for Rs 6.6 crore, police said.