(ANNAPOLIS, Md.) -- A pair of small packages burst into flames inside two government office buildings in Maryland on Thursday, causing minor injuries, evacuations and a federal probe into who might have sent what appears to have been incendiary bombs similar to devices recently mailed to embassies in Rome and in Greece.
The explosives were described as incendiary devices that looked like a small padded envelope or a book. One exploded at the Department of Transportation headquarters, located near the Baltimore airport. The other erupted at the Jeffrey Building in downtown Annapolis, which is home to several departments, including the Maryland secretary of state and the the Maryland Office of Homeland Security.
Five people were being treated for minor injuries, but there were no fatalities, Ed McDonough, a spokesperson for the Maryland Emergency Management Agency, told ABC News.
It is too early to tell who may have planted the devices, which detonated shortly before 1 p.m.
The devices are similar in both size and packaging that alarmed Europe in recent weeks. In Italy, where authorities found a string of such suspicious packages at embassies, anarchist groups claimed credit.
Packages were described as "bursting into flames" a federal source said, rather than an explosion. McDonough said it was a relatively small detonation that released a sulfuric odor.
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