STAMFORD — Police are investigating after at least two pedestrians were struck in separate accidents Tuesday morning. The first accident was reported about 9 a.m. near Stamford Twin Rinks in Springdale. A witness said he saw a Jeep strike a man as the driver turned left from Hope Street onto Camp Avenue. The victim had an apparent head injury, according to scanner reports. About 30 minutes later, another pedestrian was hit on Atlantic Street near South State Street.