Pennsylvania Avenue Shut Down After Boston Marathon Explosions

From CBS:

Shortly after several explosions occurred at the finish line of the Boston Marathon, Secret Service shut down Pennsylvania Avenue outside the White House, cordoning off the area with yellow police tape.

Several Secret Service patrol cars also blocked off the entry points to the road, and the security perimeter at the White House has been expanded.

Secret Service spokesman Ed Donovan says the measure was taken “out of an abundance of caution.” He says it is not unusual to expand or contract the security perimeters.

The White House says President Barack Obama has been notified about the explosions, and that he has called Boston’s mayor and the Massachusetts governor to express his concern for those injured in the explosions.