By Rusty Surette, NEWS 9

OKLAHOMA CITY -- A man is in police custody after opening fire at a northwest Oklahoma City apartment complex near Hefner and Council roads.

Police said the man started firing multiple shots in the parking lot of the Tammaron Village apartments around 4 p.m. Thursday.

Witnesses said the man initially went into the apartment complex's main office. When employees locked him out, he opened fire in the parking lot.

As the man was firing shots, another citizen armed with a gun came around the corner and ordered the gunman to put his weapon down. The gunman dropped his weapon and ran into his father's apartment and barricaded himself inside.

Oklahoma City police, the tactical team and the bomb squad were called out to negotiate with the man. The man finally surrendered just before 7:30 Thursday evening.

Police said the man opened fire because he was upset with his military status.

Several people at the apartments told NEWS 9 the gunman was a Marine who was on leave and came home for the holidays.

Oklahoma City police Capt. Patrick Steward said the man was taken to a hospital for a mental health evaluation. Police also said he was drunk at the time of the incident.

Police are not saying what branch of the military he was in or what his name is.

No one was injured during the incident. The gunman's name has not been released. It's not known if he will be facing any charges.