Simonds Elementary School was locked down for about 30 minutes on Wednesday afternoon after a daycare worker saw two boys with guns.
"They were running away from the school," said Cpl. Holly Marks, who speaks for Langley RCMP.
Police locked down the school as a precaution, Marks said.
Classes had ended for the day, but a number of staff, parents and students were inside for a book fair, and the daycare was still open.
Several police vehicles descended on the Langley City school, which is located at 20190 - 48 Ave. Air One and dog handlers were brought in, but there was no sign of the boys, Marks said.
She said that police are very concerned about the incident. "That is why we treated it with the utmost concern," she said.
The incident occurred only days after a similar one at Langley Secondary. On Nov. 22, Langley Secondary School was locked down for several hours after reports that a male entered the school carrying a weapon.
The incident, which sparked the closure of the airspace above Langley Regional Airport and the lockdown of Christian Life Assembly to the west of the school, ended after several hours with the arrest of a 17-year-old LSS student who was found to have a replica gun.
Police said he will not be charged.