Seattle police said three witnesses pinned the man to the ground outside the store before officers arrived to arrest him.

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A 63-year-old man allegedly stabbed another man while trying to rob a grocery store in the University District Saturday afternoon before onlookers piled on top of him and pinned him to the ground, according to Seattle police.

Police said the suspect entered the Safeway store 4732  Brooklyn Ave. N.E. at 3 p.m. and asked the cashier for change. When the clerk opened the till, the man drew a knife and demanded the register’s money, according to police.

A 26-year-old man who saw the exchange tackled the suspect to the ground before the older man stabbed him and ran for the door, according to police.

Two more witnesses intervened and piled on top of him on the sidewalk outside the store to hold him down, according to a news release from Seattle police.

Officers on patrol in the neighborhood saw the heap near the store. They called medics to take the wounded man to Harborview Medical Center and arrested the suspect on suspicion of robbery, police said.

Police booked the suspect into King County Jail.