A 5.9 magnitude aftershock hit Haiti at 6.03 a.m. ET on Wednesday morning, about 35 miles (60 kilometers) west-southwest of Port-au-Prince.
ET means Eastern Time.
This is the strongest aftershock after the 7.0 earthquake on 12 January 2010.
Aftershocks are earthquakes that happen after the first earthquake.
People screamed and ran to the streets because they are scared that the buildings will fall on them.
The rubble from the damaged buildings can fall on people’s head.
The damaged buildings can also collapse and hurt more people.
Maybe more people are injured and more buildings are damaged and more rubble block the streets.