A powerful earthquake hit the impoverished country of Haiti on Tuesday, collapsing the presidential palace and numerous other critical government buildings and raising fears of substantial casualties in what a witness called “a major, major disaster.”

The earthquake had a magnitude of 7.0 and was centered about 10 miles west of the capital, Port-au-Prince, according to the U.S. Geological Survey. It was followed by at least eight powerful aftershocks of magnitude 5.0 or greater, the USGS reported.

“People are out in the streets, crying, screaming, shouting,” Karel Zelenka, director of the Catholic Relief Services office in Haiti told The Washington Post. “They see the extent of the damage,” he said, but can do little to rescue people.