I believe the Boston marathon bombs were pressure cooker based devices. Perfectly safe domestically but when packed with explosives...
Meanwhile there's been a multiple stabbing and fatality (the perpetrator) in Minnesota:
Quote:
At least eight people were wounded in a stabbing attack at a shopping mall in the US state of Minnesota, before the suspected attacker was shot dead by police, officials say.
The attack happened in St Cloud, 70 miles (110km) north-west of Minneapolis. The motive is unclear.
The suspected attacker reportedly made references to Allah before he was killed.
None of the injuries were life-threatening, local police said.
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http://www.bbc.co.uk/news/world-us-canada-37399862
Too early to say if these events were in any way linked.