Police, fire and EMTs responded late Sunday to two car crashes that occurred within minutes of each other in the same area of Old Stamford Road, both involving New Canaan males under 17 years old. The front-seat passenger of a BMW with three teens inside that crashed around 8:35 p.m. suffered a significant leg injury and had to be extricated from the vehicle, according to police. The BMW had been traveling southbound in the area of 93 Old Stamford Road when it traveled off of the roadway and struck two trees, police said. Two passengers from that car were transported to the Norwalk Hospital Emergency Room by New Canaan Emergency Medical Services, police said. The passenger with the leg injury had to be extricated by the New Canaan Fire Department, police said.