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Marc Spalsbury, 25, of El Cajon was arrested on suspicion of robbing a Vons grocery store of a bottle of liquor Wednesday night, according to La Mesa police.

Shortly before 10:30 p.m., police received a report that a man had been stabbed in the 8100 block of Allison Avenue, about a block away from the Vons.

The man had flagged down a passerby in the area and told her he had been stabbed and robbed, and she immediately called 911 to report it, police said in a statement.

While investigating the alleged stabbing, officers learned the man -- identified as Spalsbury -- had in fact gotten into a scuffle with a security guard while robbing the Vons, police said, noting he suffered a deep cut to one of his fingers.

The security guard also was injured, suffering a small abrasion to one of his elbows, police said.

Surveillance video from the grocery store confirmed Spalsbury's involvement, according to police.

Spalsbury was booked into San Diego Central Jail.