The Sunday evening performance of "Annie" was scheduled to go on. The theater plans to increase security through the rest of the run of the show.

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The 5th Avenue Theatre in downtown Seattle canceled an afternoon performance of “Annie” on Sunday, citing a security threat.

Seattle police said they arrested a suspect at his home in Shoreline on Sunday afternoon and took him into custody.

The theater received a “credible security threat” at around noon, and shortly after decided to cancel the 1:30 p.m. matinee and contact police, managing director Bernadine Griffin said by phone.

The person who made the threat was familiar to the theater, she said, declining to provide more information on the nature of the threat.

Seattle Police said that the issue was threatening language posted on social media by a former theater employee. The decision to cancel the show was made without their input, the department said.

“Theater staff advised police that the threats created an environment of fear,” the police department said on its blog.

The theater said it informed guests of the cancellation as soon as it could.

“We were advised not to publicly announce anything until all patrons and staff were safe,” according to a tweet from the theater.

The Sunday evening performance of “Annie” was scheduled to go on and Seattle police were providing extra uniformed officers for security. The theater plans to increase security through the rest of the run of the show, it said.