MANILA, Philippines (AP) — Philippine police surrounded a shopping mall in Manila on Monday after a recently dismissed security guard opened fire and took dozens of people hostage, starting a standoff that began before noon and was still ongoing in the evening, an official said.

Mayor Francis Zamora of San Juan in the Philippine capital said the gunman, who was armed with a pistol, shot one person at the V-Mall. The victim was in stable condition at a nearby hospital.

Zamora said the suspect was a disgruntled former security guard at the shopping complex.

“He felt bad because he was removed as a guard,” Zamora told reporters, adding that the man tried but failed to convince fellow guards to join him. Aside from a pistol, the hostage taker yelled that he had a grenade, but authorities could not immediately confirm that, Zamora said.

“We have evacuated all the people in the shopping center and we’re in a lockdown here in the entire mall,” he said.

An initial police report said the hostage taker, who was identified as Archie Paray, shot a mall official before rushing to the second floor of the complex, where he was holding dozens of mostly employees in an office. The report said “more or less 50 staffs" were being held hostage, but it did not provide other details.

Zamora said about 30 to 40 people were being held, adding that his estimate was based on the size of the administrative office were they were being held.

The suspect was complaining of “unequal treatment,” the police report said.

He was apparently dismissed from work after abandoning his job in recent weeks without notifying management, Zamora said. He said the hostages were fine and added that authorities were trying to resolve the situation without further violence.

The suspect used his cellphone to deliver a message to the guards and the media, expressing his anger over a change in his work hours and accusing his superiors of corruption.

In a bid to appease the hostage taker, six officers in charge of overseeing the mall's security apologized to the suspect at an early evening news conference for their “shortcomings” and resigned or offered to quit.

“I’m asking for his forgiveness, and because of this, I’ll resign from my job so this crisis will come to an end,” said Oscar Hernandez, one of the security officers.

Earlier in the day, more than a dozen SWAT commandos were seen entering the mall, their assault rifles ready. Other policemen stood by outside, along with an ambulance.

The shopping complex, popular for its restaurants, shops, bars and a bazaar, lies near an upscale residential enclave, a golf club and the police and military headquarters in the bustling metropolis of more than 12 million people, where law and order have long been a concern.

Three years ago, a gunman stormed a mall-casino complex in Manila, shot TV monitors and set gambling tables on fire, killing 36 people who were mostly suffocated by the thick smoke. The gunman stole casino chips before he fled but was found dead in an apparent suicide in an adjacent hotel at the Resorts World Manila complex.

The attack, which caused guests and shoppers to flee to safety, was claimed by the Islamic State group, but Philippine authorities rejected the claim, saying the attacker was not a Muslim militant but a heavily indebted gambler.

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Associated Press journalists Kiko Rosario in Bangkok and Joeal Calupitan in Manila contributed to this report.