A failed terrorist attack in a central Stockholm district full of Christmas shoppers could have been catastrophic, Swedish authorities said late Saturday.
Police are investigating whether two explosions in Stockholm, an e-mail threat sent shortly before the attack that mentions Afghanistan and the body of a man who was apparently killed in one of the explosions are related.
"Most worrying attempt at terrorist attack in crowded part of central Stockholm. Failed -- but could have been truly catastrophic," Swedish Foreign Minister Carl Bildt said in a Twitter message on Saturday.
Swedish news agency TT received a warning ten minutes before the bombing. The warning was a recorded message in Swedish and Arabic, which arrived via e-mail, in which the attackers criticized Sweden for not taking action against a caricature of Muhammed, drawn by Lars Wilkes.
"Our actions will speak for themselves, as long as you do not stop your stupid war against Islam, your humiliation of the prophet, and your support of the pig Wilkes," the warning said.