"At least 25 to 30 people have at least one leg missing, or an ankle missing, or two legs missing," state trooper Roupen Bastajian told the AP.
Twenty-four-hour news coverage of the event allowed the media time to speculate about a broad range of possible motives. Possible motives for domestic anti-government extremists could include, cable TV commentators pointed out, that Monday was the deadline for filing federal taxes and that this week is the anniversary of the 1993 Waco, Texas, fire that killed 76 cult members and the 1995 Oklahoma City bombing that killed 168.
It's also possible that the explosions were the work of Islamic terrorists, media reports pointed out.
In the confused aftermath of the bombings, several news outlets reported that many unexploded devices were found by police. Reports still differ on whether or not there were unexploded devices. CNN cites U.S. Rep. Bill Keating, D-Mass., as saying authorities found two small, unexploded bombs.
Among the three dead victims are an 8-eight-year-old boy, according to multiple news reports that cite Boston police. The FBI has assumed control of the investigation.