Three people, including a security guard, were killed in a shooting at the Islamic Center of San Diego on Monday before two suspected gunmen, aged 17 and 18, were found dead from apparent self-inflicted gunshot wounds,

The attack is being investigated by police as a possible hate crime.

Two teenage gunmen opened fire outside the Islamic Center of San Diego in California on Monday, killing three men, including a security guard, police said. Authorities are probing the attack as a suspected hate crime targeting Muslims.

Five people are dead including two gunmen who police said entered the Islamic Center of San Diego on Monday morning and opened fire.

San Diego Police and SWAT officers rushed to the Islamic Center of San Diego Monday afternoon after reports of an active shooter prompted evacuations and a large emergency response.

Officers began receiving calls before noon about a shooting outside the mosque, police said.

Two ​teenage gunmen opened fire on Monday at the Islamic Centre of San Diego in California, killing three men outside the mosque, one of them a security guard, before the two suspects were ​found dead,

Authorities are now piecing together the horrific hate crime that left five people dead – including the two suspected teenage gunmen – and has rocked California and the US.

More than $1.5 million has been raised for the family of the heroic San Diego mosque security guard, Amin Abdullah, who died while shielding children and staff from gunfire during a mass shooting Monday.