Police arrested a passenger after he threatened to hijack a plane flying to New Delhi from the western tourist destination of Goa. The domestic airliner made an emergency landing Sunday at New Delhi Airport and was quickly surrounded by police commandos who arrested the unarmed man, Indigo Airlines President Aditya Ghosh said. He declined to say where the man wanted the plane to go, or whether there was a struggled aboard the plane. All passengers later disembarked safely, Ghosh said in a Monday statement. Police were questioning the man, and other details were not immediately available, said police spokesman Rajan Bhagat. If convicted, he faces up to seven years in prison. Indian security agencies have been on high alert since gunmen killed 164 people in the Nov. 26 terrorist attacks in Mumbai.