"Then we'll change phase... We'll start using heavier means to remove the debris and blocks of concrete. We will recover all the bodies and destroy the building."
Earlier on Sunday, anger reportedly boiled over as relatives demanded rescuers speed up the search for victims in the remains of La Promesse College in Petionville.
Haitian police and UN peacekeepers in riot gear drove away a group of around 100 men who rushed onto the unstable rubble pile trying to remove debris, according to AP news agency.
"Everybody is frustrated. We smell the bodies," said 25-year-old onlooker Emmane Petitehomme.
A lucky few were plucked alive from the rubble
Pope Benedict XVI sent a message of sympathy to Haiti, Vatican Radio said on Sunday.
Haitian President Rene Preval, who has made several visits to the disaster site, said the school had been built with hardly any structural steel or cement to bind concrete blocks.
Rescuers had worked through the night on Saturday under floodlights in an effort to find survivors in the remains of the building. About 500 children and teachers were inside the school when it crumbled.
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