San Bernardino shooting: Motive still unknown

Police in California are continuing to investigate a mass shooting in which 14 were killed and 17 others injured.

A man and his wife dropped off their six-month-old daughter before arming themselves with assault rifles and opening fire at a social services centre.

Syed Rizwan Farook, 28, and Tashfeen Malik, 27, were later shot dead in a gunfight with police.

The motive for the attacks is not yet known, although President Obama later said terrorism could not be ruled out.

Jon Sopel reports.