Two bombs detonated near the finish line of the Boston Marathon, a renowned long-distance running event held annually in Boston, Massachusetts. The investigation revealed that the devices were pressure cooker bombs placed in backpacks, hidden among the crowded spectators. The explosions occurred approximately 12 seconds apart, targeting the area as thousands celebrated the conclusion of the marathon. The chaos that ensued was substantial, with first responders rushing to aid the wounded, while others fled the scene in panic.

The aftermath of the attacks was marked by a massive manhunt for the perpetrators, which resulted in a standoff and subsequent death of one suspect, Tamerlan Tsarnaev. His brother, Dzhokhar Tsarnaev, was later captured and charged as well. The event garnered international media coverage and raised awareness about domestic terrorism. Steps were immediately taken to enhance security at public events across the country, leading to changes in how large gatherings are monitored and protected.

In the days following the bombings, the public responded with an outpouring of support for the victims, and the phrase 'Boston Strong' became symbolic of resilience and unity. The city held a memorial service for those affected, and there was a significant emphasis on the importance of community in the face of adversity.