The Philippines' top labor official says a rubber slipper factory where a fire killed 72 people has violated employment laws.

Police and other agencies are conducting separate investigations looking into safety records and criminal liability.

Labor Secretary Rosalinda Baldoz said Friday at least 104 workers at the Kentex Manufacturing Corp. were recruited by an illegal sub-contractor. She says owners will be summoned to answer the charges next week.

Officials couldn't say how many workers were at the factory in a Manila suburb when the fire raged Wednesday because records were lost.

It was one of the worst fires in the country after the 1996 disco blaze where 162 people died. Another fire at a budget hotel in 2001 killed 75.