PRAGUE -- An American man accused of killing a family of four in the Czech Republic has been arrested in the United States, police said Friday.

Leos Trzil, regional police chief in Brno, said Kevin Dahlgren was arrested at an airport in the Washington, D.C., area late Thursday after the Czechs issued an international warrant.

The suspect fled to the U.S. after the victims -- identified by neighbors as a married couple and their two sons-- were found by firefighters who came tackle a fire Wednesday in a house in Brno, the country's second-largest city.

Police investigator Antonin Hrdlicka said the pilots and crew of the flight from Vienna were informed that the suspect was onboard.

Czech police said Dahlgren was born in 1992 and released his photograph. A Facebook page showing the same photograph says that Dahlgren is from Palo Alto.

Police spokeswoman Petra Vedrova said that all four victims were related. A Czech public television station reported that Dahlgren was the nephew of the slain parents, but that was not confirmed by police.

A local band, Ukulele Orchestra jako Brno, told The Associated Press that two of its members were among the victims, but declined to comment further. Dahlgren's Facebook page contained a link to the band.

Police and neighbors said Dahlgren had only been in Brno for a few weeks.

Police have declined to give details about the killings, and said the motive was not known. "Various weapons were used but that's all I can say," Hrdlicka said. Vedrova said guns were not used.