Two people who allegedly opened fire at the Inland Regional Centre in San Bernardino, California, a developmental disability facility, on Wednesday morning local time have been killed in a shoot-out with local authorities.

A third suspect has been detained. It is unconfirmed if this person was involved in the mass shooting, which killed 14 and wounded 17.

“[The gunmen] were dressed in a way that indicated they were prepared,” County Chief Jarrod Burguan said. “They came in [to the centre] with a purpose, they came in with an intent.”

LIVE: San Bernardino Mass Shooting

The Inland Regional Centre is a facility run by the state serving people with developmental disabilities. The county’s Department of Public Health was having a party in one of its rooms when the shooting took place.

Investigations are ongoing and the motives of the gunmen are still unknown.

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