POLICE believe a gang using a stolen taxi to rob passengers may have re-surfaced after a one-year break. The gang is believed to have robbed a taxi driver, taken his vehicle and then used it to rob two passengers on separate trips early yesterday. Police said a man got into a taxi outside the Capital Theatre in Shamshuipo on Wednesday night. He asked the 43-year-old driver to take him to the Au Pui Shan Boys' Home near Kau Wah Keng. When he arrived two men were waiting and the trio overpowered the driver. The victim was pushed out of the taxi which was seen speeding towards Kwun Tong with the three men on board. Just over an hour later, a 39-year-old man got into a taxi in Tsim Sha Tsui East and when the car arrived in Hunghom, two men got on board. The passenger was robbed of a Rolex watch worth $32,800, $4,000 in cash and a credit card. At about 3.50 am, another man was robbed in similar fashion and a police source said it was highly possible the robberies w ere done by the same gang. ''There was a spate of these robberies in 1990 and 1991. As far as I can recall the last time it happened was in October last year.''