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Reed said he was upset over an advertised hip-hop concert that he said drew 600 people to the park over the weekend but didn’t have a permit and didn’t have security guards to work the crowd, calling it irresponsible.

Reed told reporters he had serious security concerns that he said were heightened Tuesday when a man was seen in the park with an assault rifle. The mayor said authorities could not determine whether the weapon was loaded, and were unable to get additional information about it.

An Associated Press reporter talked to the man with the gun slung across his back earlier Tuesday as he walked in the park. He wouldn’t give his name, but said he was an out-of-work accountant who doesn’t agree with the protesters’ views, but was there, armed, because he wanted to protect the rights of people to protest. There’s no law that prevents him from carrying the weapon in public, but several police followed him for about 10 minutes before moving off.

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Associated Press reporters Terry Collins in Oakland, Calif., and Marcus Wohlsen contributed to this report