No way, no how! There is already silly talk of president Obama using executive order to force a nation wide ban on fireworks. Come on people, this is not only possible it may be the biggest knee jerk reaction ever!
While the suspects may (or may not) have purchased fireworks, the amount claimed would not have near the power needed to produce the results we saw in Boston. In Fact, there are many, many readily available common household items that are far more energetic than what the U.S. Consumer Product Safety Commission allows in Fireworks.