A 300-pound egg-shaped security robot was punched to the ground by an allegedly drunken man outside a Silicon Valley shopping center, Mountain View police said.

A 41-year-old Mountain View man has been arrested in connection to the alleged parking-lot altercation with the Knightscope-made droid. The accused robo-assailant, who faces charges of prowling and public intoxication, was identified as Jason Sylvain. The robot suffered minor scratches and is back on duty following last week’s incident.

Mr Sylvain was not immediately reachable for comment.

The five-foot-tall, K5 robots can read 300 license plates per minute. They also are equipped to supply 360-degree video streaming. Once an anomaly is detected by these robots, they alert security guards. The robots are not armed.

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