AceShowbiz - Rapper O.T. Genasis' 30th birthday party in Los Angeles ended with an armed police raid on Wednesday, June 13 amid false reports of a gun threat.

The birthday boy had been celebrating his age milestone at Pinz bowling alley with pals including singers Miguel and Tamar Braxton, and fellow MC Nelly when cops swarmed the building.

According to TMZ.com, authorities were responding to an emergency call reporting a heated altercation at the venue, where two people had allegedly threatened one another with guns.

However, when the officers arrived to investigate the claim, the news apparently came as a surprise to Genasis and his guests, and no weapons were found.

A few people were briefly detained, but no arrests were made after cops reviewed the venue's surveillance footage, and the big search, which also included the use of a police helicopter, was called off.