1 In custody, 1 on the loose after armed robbery

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PHOENIX -- One man is in custody and another is on the loose after a late-night armed robbery at a Phoenix convenience store.

Clerk hit silent alarm

It happened just after 11 p.m. Monday at an ampm store at 23rd Avenue and Indian School Road.

According to police, the suspects were trying to buy some beer and showed the clerk an invalid ID. The clerk refused to sell them the alcohol.

That's the when suspect pulled a gun, took the beer and left.

What the suspect did not know is that clerk had already tripped the silent alarm and the police were on the way.

"This is proper business practice," said Sgt. David Lake of the Phoenix Police Department. "They did the right thing as a victim. They used the alarm rather than confront the suspect, get into an argument. Just let him take the beer and contact police. They did that and fortunately, the system worked."

Police caught the suspect running from the scene. He was arrested and taken to jail.

The man's accomplice is still on the loose.