A 6.6 magnitude earthquake rocked buildings on Friday morning in Anchorage and caused lamp posts and trees to sway, prompting people to run out of offices and seek shelter under office desks.
The National Tsunami Warning Center has issued a tsunami warning for coastal zones of southern Alaska following an earthquake that rocked buildings in downtown Anchorage.
The center said Friday that the warning was in effect for parts of the state's Cook Inlet and the southern Kenai peninsula.
The US Geological Survey says the earthquake was centered about 7 miles (12 kilometers) north of Alaska's largest city.
An Associated Press reporter working in downtown Anchorage saw cracks in a 2-story building after the quake. It was unclear whether there were injuries.
People went back inside buildings after the earthquake but a smaller aftershock a short time later sent them running back into the streets again.
Shortly after the quake, a tsunami warning was issued for the southern Alaska coastal areas of Cook's Inlet and part of the Kenai peninsula.
The warning means tsunami waves were expected.
The US Geological Survey initially said it was a 6.7 magnitude earthquake and then reduced the magnitude to 6.6.
Residents say quake was worst in years Anchorage lawyer Justin Capp says he was getting ready for work when he felt the shaking start.
He grabbed on to the doorframe in the hallway and the door slammed into his hands, scraping his fingers and hand.
Capp says he's lived in Anchorage eight years and that Tuesday's quake was the worst he had experienced. Another lawyer, Hank Graper, was driving when the quake struck.
He first thought his vehicle had a flat tire, then thought it was exploding.
He realized it was an earthquake after he saw traffic poles swaying. Graper called it the most ``violent'' earthquake he's experience in his 20 years in Anchorage.