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Boston bombings a 'cowardly act' says President Obama

16 April 2013 Last updated at 17:18 BST

US President Barack Obama has described the Boston Marathon bombings as "a heinous and cowardly act".

Mr Obama said the attack which killed three people was "an act of terror" but stressed it was not yet known which group or individual was behind it.

"It will take time... but we will find whoever harmed our citizens and we will bring them to justice."