The Boston Marathon bombing occurred on Monday, April 15, 2013. The attack took place during the annual marathon, which is traditionally held on Patriots' Day, a state holiday in Massachusetts.
Two pressure-cooker bombs were detonated at approximately 2:49 p.m. Eastern Daylight Time near the marathon's finish line on Boylston Street. The explosions, which occurred about 14 seconds apart, resulted in three deaths and injured several hundred others, many of them critically. The timing was significant as it corresponded with a peak period for spectators and race finishers.
The event initiated an intensive investigation and a four-day manhunt for the perpetrators. This search concluded on the evening of April 19, 2013, with the capture of the second suspect. The entire sequence of events, from the bombing to the final apprehension, spanned a period of five days.