5/1/2013, 9:10 a.m.
Vice President Joe Biden shakes hands with MIT Police Chief John DiFava at the memorial service to honor MIT Police Officer Sean Collier at Brigg’s Field in Cambridge on Wednesday, April 24.
The flag-draped coffin of Officer Sean Collier is taken to Brigg’s Field by his fellow MIT officers at the conclusion of the memorial service to honor the fallen officer on the MIT campus in Cambridge on Wednesday, April 24.
Crews scrub the streets in the aftermath of the Boston Marathon bombings.
Flags fly at the memorial site of the Boston Marathon bombings on Boylston Street.
(Photos courtesy of the Mayor’s office and the Governor’s office)