PORT-AU-PRINCE, Haiti (AP) _ Gunmen demanding jobs seized an orphanage run by former President Jean-Bertrand Aristide Thursday, holding it for more than 12 hours before surrendering.

Police fired tear gas over the wall of the Family is Life center, home to about 300 children, to bring the standoff to an end. Officers arrested about 30 of the attackers as they fled the fumes, but some suspects escaped.

There were no immediate reports of any serious injuries.

The takeover began when a small group of young men who had graduated from the orphanage entered the center around midnight, armed with hand grenades, pistols and machetes, said a security guard, speaking on condidtion of anonymity.

The assailants were demanding jobs and accusing Aristide of making money off their misfortune.

A few hour later, about 40 other protesters entered the orphanage, in midtown Port-au-Prince, the guard said.

Some of the protesters threw stones and bottles at passing vehicles, when police responded by firing tear gas. One police officer and four youths were injured in the hail of rocks.

``They lied to us!'' some of the protesters shouted to reporters, saying they had been promised work after graduation at 18. Eighty percent of Haiti's 7 million people are unemployed or underemployed and there are about 4,000 homeless children in Port au-Prince.

``Aristide is making money off us,'' they said, referring to local and international aid that Aristide receives to help run the center, which he founded in 1986.

``The graduates are gangsters,'' Aristide spokesman Dany Toussaint responded on Radio Metropole.

He said they had been ``paid to create problems'' and smear Aristide's reputation.

Police officials say the protests are aimed at creating unrest in the runup to November legislative elections that could help resolve a 2 1/2-year power struggle between opponents of Aristide and the man he hand-picked to succeed him, President Rene Preval.