Developing story from IE:

A US Northwest Airlines plane bound for Mumbai was turned back to Amsterdam’s Schiphol airport on Wednesday accompanied by Dutch fighter planes due to worrying passenger behaviour, officials said.

“Northwest flight number 42 from Amsterdam to Mumbai with 149 passengers returned to Amsterdam when a couple of passengers displayed behaviour of concern,” said Northwest spokeswoman Kristin Heinmets, speaking from Minneapolis.

A Dutch air traffic control spokeswoman said the plane was in German airspace when it turned back. A spokeswoman for Schiphol said the pilot had taken the decision.

“We are cross-examining witnesses, passengers and crew,” a Dutch police spokesman said, adding no arrests had been made and the passengers were being questioned near the craft, a 273-seat DC10-30 plane.