Washington school shooting: Students in lockdown at William Wiley Elementary as police rush to the scene

A woman was shot at an elementary school in Washington state during dismissal, before police found a second victim in the suspected killer's home on Monday.

Elias Huizar, 40, a former police officer, is on the run after the shooting just outside of William Wiley Elementary School in West Richland, Washington.

Police said they are searching for Huizar, who fled the scene in a 2009 Toyota Corolla with the license plate CBZ4745. 

Upon conducting a search warrant at Huizar's home near the school, they uncovered a second homicide victim, whom they said was not Huizar but a 'known associate.' 

The school district in Richland, Washington, sent out an alert to parents that confirmed a shooting at William Wiley Elementary.

The shooting occurred at 3:23pm local time. The unnamed woman was shot and killed, police confirmed Monday evening. There were no further casualties.  

Elias Huizar, 40, a former police officer, is on the run after the Monday afternoon shooting just outside of William Wiley Elementary School in West Richland, Washington, where he was once employed 

A shooting at an elementary school in Washington state during dismissal has put the school on lockdown

Richland Police confirmed in a Facebook post they were headed to the scene Monday afternoon

The school district in Richland, Washington, sent out an alert to parents that confirmed a shooting at William Wiley Elementary

West Richland Police are reportedly searching a home on South Highlands Boulevard down the street from the school, while SWAT vehicles have arrived on campus. Loud bangs were heard outside the home at 5:25pm local time.

'West Richland Police Department believe to know who the perpetrator and have their house lock-downed,' they told NBC. 

'The perpetrator is still at large. The district is working on the reunification efforts. Another update will be sent soon.' 

A resident said he heard four to five gunshots while in his backyard Monday afternoon.  

'I thought it was someone hitting something with a hammer. It didn't sound like a gun. Then a woman came flying out here before the cops even got here and started screaming that someone was shot ,' Chris Worley told the Tri-City Herald. 

The school district sent an alert to parents, adding that any students still on campus were sent into a secure area, even those who were getting set to depart on the school bus.

'Students and staff at our schools have been moved inside the buildings and place into a critical lockdown.'

The school district sent an alert to parents, adding that any students still on campus were sent into a secure area, even those who were getting set to depart on the school bus

All after-school activities at the school were canceled 

'If students were loaded on buses but still at the school, they were moved into the school building. We will update you once we have more information.'

Richland Police confirmed in a Facebook post immediately after the shooting that officers were headed to the scene.

'There is an active incident in the area of William Wiley Elementary and South Highlands Blvd,' they wrote. 

'Please stay clear of the area. We will post updates as they become available.'

All after-school activities at the school were canceled. Around 4:45pm, police began getting the locked-down children out of the school.

An app connected to the school is telling parents where they'll be reunited with their children. Because the road is completely blocked off, some parents are still waiting to get their vehicles back. 

Classes have been canceled at William Wiley Elementary on Tuesday. 

DailyMail.com has reached out to the West Richland Police Department, who are handling the investigation, for comment.