KANSAS CITY, Kan. – Police are searching for contracted school employee who allegedly fired a gun at a coworkers during a dispute at a local elementary school, and hit the building with one of the bullets.

Kansas City police spokesman Patrick McCallop told Fox 4 officers responded to shots fired at Mark Twain Elementary School at 10:11 a.m. Wednesday, and the incident devolved from an argument between maintenance workers there on a landscaping project.

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A temporary employee contracted through Labor Ready left the group and came back to the playground area where they were working a few minutes later with a handgun firing shots in the group’s direction, one of which struck the building with hundreds of students inside.

Wyandotte High School is also two blocks from the playground, well within firearm range.

“I believe they said five to six (shots) was the last I heard. We’ve only found one hole in the building that we believe is a bullet hole,” officer Tom Tomasic told the news site. “Fortunately, no one was hurt, especially the children in both schools.”

Witnesses told police the suspect, who was not identified in media reports, fled the area immediately after the shooting and may have gotten away in a vehicle. Police are now attempting to track the man down.

Officials at both the elementary and high school implemented a “lockout” policy – sealing off the building but resuming classes as normal – following the shooting. It was lifted around noon, when students were released for the day, the Kansas City Star reports.

Some worried parents went to the elementary school when then heard about the shooting.

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“My neighbor just called me and she said that she heard some shooting, so I just got off work to come here to make sure my daughter is okay,” father Arnolda Najera told Fox 4. “I’m going to give her a hug.”

District officials would not discuss their relationship with the school contractor, but told Fox 4 they suspended its contract with Labor Ready and plan to more closely scrutinize the company’s process for background checks.

Several parents who learned about the incident from news reports were irate they were not contacted by school officials.

Parent Trisha Campos said if it wasn’t for a Facebook post, she wouldn’t have known her daughter was in danger at the elementary school Wednesday.

“I didn’t want to look at Facebook and learn that there’s a shooting around here,” Campos told Fox 4. “I just ask that at least text messages or at least something go immediately to parents.”

District officials countered that they sent a text message to parents signed up for emergency notifications, but several parents who claim to be on that list confirmed they did not receive any communications from school leaders.