CONCORD - Extra uniformed officers were at Concord High School Wednesday morning after two threatening incidents over the past week.

Lt. Timothy O'Malley said a threatening message directed at the staff was scrawled across a boys' bathroom wall on Jan. 29. The threat was serious, he said, and specified it would be carried out Wednesday, Feb. 6.

On Tuesday, a student reported seeing three bullets in a toilet bowl of another boys' restroom sometime between 1 and 3 p.m. He reported it to the school resource officer, but by the time they returned, the bullets were gone. Police don't know if someone flushed them down the toilet or removed them.

"I hope no one reached in and took them," said O'Malley. "You never know. Stranger things have happened."

They don't know who brought the ammunition to school or why, he said.

O'Malley said the police department had plans to increase police presence at the high school when the threatening message was discovered, details of which he declined to give citing the ongoing investigation. That presence was increased after the ammunition report was received.

He said the recent incident heightened concerns and school officials sent out a letter to parents about the situation.

O'Malley said extra police patrols were assigned to the school Tuesday and were there again Wednesday on school grounds.