TEWKSBURY (CBS) — A Tewksbury smoke shop worker was held up at knife point Friday night, but first thought it was a joke.

Clerk Kinner Adhwaryu was getting ready to close the store when the masked robber came in through the door.

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“I thought it was a regular customer or one of my friends trying to play a joke,” Adhwaryu said.

Kinner Adhwaryu, the clerk robbed at knifepoint in Tewksbury. (Photo credit: WBZ-TV)

But the incident became real in a hurry.

“He came in a strange way and came near the middle of the store and said, ‘Hey give me all the money from the register,” he said.

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The suspect tried to jump over the counter and Adhwaryu tried to push back.

“He jumped but then I pushed him away. At that time he pulled out the knife and that time I realized I was being robbed,” Adhwaryu said.

Robber with a knife on the surveillance video. (Photo credit: Tewksbury Police)

He handed the robber the cash and watched him run out of the store.

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The Tewksbury Police are in the process of searching for the suspect.