German police say a suspected gunman who shot dead two US airmen at Frankfurt Airport operated alone and was probably inspired by radical Islamist beliefs.
Arid Uka, a 21-year-old postal worker of Kosovan origin, has allegedly confessed.
Posts on his Facebook account are said to praise jihadists and denounce non-Muslims as infidels.
Neighbours from his Frankfurt suburb said they were shocked.
One woman said that he was often lone and did not have any friends on the estate.
“Although there are some bad people here for the police to deal, he was not that type and was very withdrawn,” she said.
Investigators believe the suspect was not part of a wider terror network and was radicalised on the Internet.