Two bombs exploded at the finish line of the Boston Marathon at 3 p.m. on Monday as runners were still making their way through the race.

The Boston Police department has announced that 2 people are dead at least 90 have been injured as a result of the blasts. Some of those injured have had amputated limbs according to hospitals, the Boston Globe reported via Twitter. The Globe also reported that the city has called in all off-duty officers.

A small homemade bomb is the preliminary cause of the explosion, law enforcement officials told NBC News. The bomb bomb squad is still sweeping the Boston area for more bombs. There have been reports that “secondary devices” have been located by scanners, including two that are being dismantled. Cambridge Police reported that bombs might be located at Brattle Street and Farwell Place in the Boston neighborhood. The police have been urging bystanders to leave the streets and return to their residences.

The marathon began at 9 a.m. in Hopkinton, Mass. with the mobility impaired. The elite women’s race, which began at 9:32 a.m. saw Rita Jeptoo finish first. The men’s race started at 10 a.m. with Lelisa Desis of Ethiopa finishing the face first in a little more that 2 hours and 22 minutes. Amatuer runners began around 10:30 a.m. When the bomb went off at 3 p.m., roughly 500 runners we’re still on the marathon course.

"At this time, we haven't been notifed of any arrest or anyone apprehended," a Boston Police Department spokesperson told TPM LIvewire.

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