Two of the three terminals at the airport of the West German city of Duesseldorf have been reopened after a security incident while the third terminal is expected to open shortly, a spokeswoman for the airport said on Friday.

Police on Friday cleared all gates at the airport after three unauthorised individuals entered the security perimeter, a police spokeswoman said.

She said the police was interrogating two of the three individuals, while it was still searching for the third person, adding that the reasons for the incident were yet unknown.