DITMAS PARK - A $1,000 reward is being offered to anyone with clues that could help solve a wave of token booth robberies in Brooklyn subway stations. The latest station hit was Kingston on Saturday night. Police say a group of robbers ambushed transit workers during shift changes. Authorities and transit union officials have set their sights on 2 men and 2 women whom they believe could be part of a gang. Officials say robbers made off with nearly $2,000 from the token booth attacks. Authorities say the suspects are still on the loose.