At least three people are dead after a shooting at an elementary school in the USA.

Several students are also reported to be injured.

The incident occurred at Rancho Tehama School in Tehama County, 200km away from San Francisco. 

The gunman was killed by authorities. 

'I know that we have airlifted a number of students,' Assistant Sheriff Phil Johnston told KCRA3.

'I know that the school's been cleared. I know that we have children that were attending school in a safe location at this time.'

The area remains on lockdown at this time. 

We will bring you more on this story as we have it.