(AP) - A powerful aftershock sent Haitians screaming into the streets on Wednesday, collapsing buildings, cracking roads and adding to the trauma of a nation stunned by an apocalyptic quake eight days ago.

The magnitude-5.9 jolt matched the strongest of the aftershocks that have followed the huge quake of Jan. 12 that devastated Haiti's capital.

The new temblor collapsed seven buildings in Petit-Goave, the seaside town closest to the epicenter, according to Mike Morton of the U.N. Disaster Assessment and Coordination agency, but there were no reports of people crushed or trapped, perhaps because the earlier quake frightened most people into sleeping outside.

Wails of terror erupted in Port-au-Prince, where the aftershock briefly interrupted rescue efforts amid the broken concrete of collapsed buildings, and prompted doctors and patients to flee the University Hospital.

Hundreds of thousands of Haitians remain homeless, hungry and in mourning - most still waiting for the benefits of a nearly $1 billion global aid campaign that has brought hundreds of doctors and thousands of troops to the impoverished Caribbean nation.