Four people, including three children and one adult, were killed in the shooting at Silver Rail Elementary School in Bend, Oregon on Thursday, law enforcement sources told the Daily Mail.

Authorities had earlier confirmed that two people were rushed to a local hospital following the shooting, but their conditions were unclear.

Congresswoman Janelle Bynum announced that she is halting all campaign activity following the shooting, saying she is ‘focused on supporting and being with the community as it responds to this tragedy.

‘I feel this deep, deep, deep in my soul,’ she said in a statement. Our whole community does. Our whole state does. And the whole nation should.

‘Our babies are supposed to do arts and crafts at school, not use their desks as cover from gunfire. They’re supposed to make friends, not mourn them. This is every parent’s worst fear.

‘My heart and my prayers and everything else I got is with the families at Silver Rail Elementary. When will it end?’

Bend-La Pine Schools Superintendent Steven Cook has spoken out about the shooting.

‘We are stunned and heartbroken by this senseless tragedy,’ he said in a statement.

‘We extend our deepest sympathy to the families and to everyone affected by this violence. No words can adequately express the grief our community is experiencing.’

Cook added that the district’s ‘immediate priorities are caring for our students and staff and assisting law enforcement and emergency responders.’

Police officers are going room by room to evacuate the school, which has between 400 to 450 pupils and a staff of more than 40, police spokeswoman Sheila Miller said at a news conference.

The students will then be taken by a bus to an off-site reunification center.

Oregon Governor Tina Kotek said she is ‘closely monitoring the situation at Silver Rail Elementary.’

‘I am grateful to the first responders who are on the scene. I will share as I learn more,’ she said in a statement.

FBI agents have arrived at the scene to assist with the ongoing investigation, Kash Patel announced on social media.

‘We will make every resource they need available,’ he said.

The Bend Police Department said the suspected elementary school gunman, who was shot by an unknown bystander, is believed to have acted alone.

Police announced there was one lone suspect in the tragedy, who was fatally shot moments after police arrived just after 1pm.

Bend police spokesperson Sheila Miller said that the suspect had been inside the school, NBC News reported.

US Senator Jeff Merkley announced that his team was monitoring the situation after shots rung out at Silver Bend Elementary School on Thursday.

‘As details continue to come out, my heart is with the Bend community and all of the students and families affected,’ he said in a statement.

‘No one should have to fear violence at school.’

Later, Senator Chris McDaniel also asked the public to ‘please join me in praying for the children at Silver Rail Elementary School in Bend, Oregon.

‘Pray for the teachers trying to protect them, the parents waiting desperately for word and the officers and first responders rushing to help,’ he posted on social media.

‘We don’t yet know the full story, but somewhere tonight, mothers and fathers just want to hold their babies,’ McDaniel noted.

‘Lord, protect those children. Bring them home safely.’

Children were said to be among ‘multiple victims’ after shots were fired at Silver Rail Elementary School just before 1pm on Thursday.

Police arrived on scene by 1.02pm and seconds later the gunman was shot by an unknown shooter, officials said.

The gunman was confirmed to have been killed, as it is believed a bystander may have brought the suspect down.

The Bend-La Pine School District also announced on social media that the school has been placed on lockdown, and reports from the scene indicate that at least one class has been released, according to the Bend Bulletin.

Officers have now set up a reunification site for parents of children at the school at nearby Journey Church.

Meanwhile, paramedics were seen setting up a staging area outside of the school, where at least two people were rushed to a local hospital.