JAKARTA - A moderately strong earthquake of magnitude 6.1 shook the Indonesian island of Java on Tuesday, damaging buildings near the epicenter and shaking office buildings in the capital.

Zainal, who heads Banten province's search and rescue agency, said the quake damaged houses and other buildings in Lebak district, including a high school and hospital and a mosque in Pandeglang district collapsed.

At least one person was killed, and at least 20 people were injured, including eight students.

In Jakarta, office workers fled high-rise buildings in the capital after the strong earthquake shook the city, causing some injuries and damage to at least 130 buildings elsewhere on the country's most densely populated island of Java.

Many people ran along the streets of downtown Jakarta, pointing at the buildings above them, witnesses said. Metro TV showed patients being evacuated from a hospital.

The quake struck about 100 kilometer west of Sukabumi, at a depth of 44 km. Jakarta is about 100 km away.

"In Cianjur, six students were seriously injured and two students suffered light injuries when the (school) roof collapsed," Sutopo Purwo Nugroho, a spokesman for Indonesia's disaster agency, said in a statement, referring to a district of West Java province.

Buildings swayed for 10 to 20 seconds and some ordered evacuations, sending streams of people into the streets.

"We felt the earthquake for three to five minutes," said Rudy Togatorop, 35, who works at the Chilean embassy.

"I was just sitting down, then I felt the building swaying. The emergency stairs were very narrow. I was worried if something would happen."

Indonesia is regularly hit by earthquakes in one of the world's most quake-prone regions.

In 2004, the Indian Ocean tsunami killed 226,000 people in 13 countries, including 120,000 in Indonesia.

In December, a quake of 6.5 magnitude killed at least three people when it hit Java at a depth of 92 km, and buildings in Jakarta swayed for several seconds. Tuesday's quake was at a depth of 44 km.

The World Bank reckons natural disasters cost Indonesia 0.3 percent of its GDP annually, but a 2015 report on disaster risk management prepared by Indonesia's government said a major earthquake, occurring once every 250 years, could cause losses in excess of $30 billion, or 3 percent of GDP.