MANILA — A disgruntled security guard who lost his job at an upscale mall went on a shooting rampage in Manila on Monday, injuring at least one person and holding up to 30 other people hostage, the police and news reports said.

One person was shot and had been taken to a hospital, Francis Zamora, the mayor of the San Juan district, where the mall is, told ANC television. The mall’s electronics and clothing stores were sealed off as shoppers were safely evacuated, but the gunman was still holding hostages inside an administrative office as of Monday afternoon. The incident began at about 10 a.m.