Report: 2 US soldiers killed in shooting attack in Germany

Two people were killed and two others were seriously injured in a shooting  at Frankfurt airport in Germany on Wednesday, the Der Spiegel website reported. Unconfirmed reports have stated that the victims were members of the US military.
According to the report, a gunman opened fire on a US military bus at the airport.
A 21-year-old suspect from Kosovo was arrested following the attack, DPA reported.
Police were still unclear as to the circumstances of the shooting and whether it was politically motivated.
The US military has several bases in the Frankfurt region.