A robbery at the Key Bank branch in Maple Valley’s Four Corners area caused a nearby elementary school to go into lockdown mode.

Around 10:15 a.m. May 9, the bank was robbed, according to John Urquhart, a King County Sheriff Department spokesman.

“A lone robber walks in with a handgun and a hooded sweatshirt pulled tight, plus a ski mask for good measure,” Urquhart said. “He left with the money.”

Urquhart added no one was injured during the robbery.

The amount of money stolen wasn’t disclosed.

Glacier Park Elementary School was locked down for about an hour while the robbery and subsequent search for the suspect were in progress, Tahoma School District spokesman Kevin Patterson said.

“We were contacted by the Maple Valley Police and advised to lock down because the bank robbery suspect was still at-large,” Patterson said. “The lockdown went smoothly and we notified parents by using the district Web page and by using the SchoolMessenger emergency phone notification system. When the lockdown ended, we used the Web and SchoolMessenger again to notify parents that we were back on regular schedule.”

The robbery suspect, who remained uncaptured this week, was described as a while man in his 20s, about 5 feet 7 inches and 170 pounds. He wore an olive green hoodie and work boots. He escaped on foot.

Officers arrested two people coming out of the woods near the bank, but they weren’t involved in the robbery, said police chief Michelle Bennett. The officers took the pair into custody “for unrelated (narcotics) crimes and booked them into jail,” she said.

Staff writer Kris Hill can be reached at (425) 432-1209 (extension 5054) and khill@reporternewspapers.com