"The one thing we do know is that we have a pattern now of mass shootings in this country that has no parallel anywhere else in the world," Obama said in an interview shortly after the attack.

Two of the gunmen were shot dead by the police in a chase hours later, while another one was apprehended. In the past few years the US has been experiencing a series of tragic mass shooting, the frequency of which has increased.

Obama said the current law which lets anyone buy gun off the shelf without any background check needs to change. The Republican controlled Congress has refused to change the law.

In San Bernardino, California where the mass shooting took place, the police shot dead two suspects – a man and a woman. Both were wearing combat-style clothing.

Read More: 14 killed in California shooting rampage; two suspects dead

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