PORTLAND, OR (KPTV) -

A man accused of robbing a downtown drug store and getting pinned to the ground by store workers is pleading not guilty.

Jocelin Olson entered that plea in court Monday. He was arraigned on robbery charges.

His trial is scheduled to begin Sept. 18.

Investigators said he threatened to kill everyone inside the Central Discount Drug on Southwest Fourth Avenue last month unless they gave him drugs and cash.

Witnesses said he claimed to have a gun, but no one saw one.

When the suspect tried to leave, police said the store owner and another employee held him on the ground until police arrived.

The case has also created some controversy regarding the response of a police officer.

A witness said he ran out of the store and told an off-duty officer about the holdup, but claimed the officer didn't respond because he wasn't on duty at the time.

Portland police leaders said the officer in question has come forward and an internal affairs investigation was immediately opened over the situation.

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Downtown pharmacy robbery suspect pleads not guilty