Phew, it’s been a whirlwind day for D.C. Fire and EMS. After spending most of the morning arranging for a helicopter to land on a D.C. freeway to whisk away a Park Police officer who was hit while riding his motorcycle, several emergency workers were called on to handle two more big incidents this afternoon. Crews responded to a collision between a Metrobus and a school bus at the intersection of 17th Street and Benning Road NE about a half-hour ago; about five minutes later, emergency personnel and a fire boat were called on to rescue eight people who apparently fell from a boat into the Potomac River. No serious injuries have been reported in either incident, although a few people requested medical attention after the two buses collided in Northeast.