(Updates death toll from 6 to 7, adds details)
PARIS, May 23 (Reuters) - Seven Moroccans died and eight were badly injured when their bus crashed on Friday in central France while they were returning from a holiday in their native country, police said.
The bus had been bound for Paris and was carrying 30 passengers and two drivers when it crashed into the support pillar of a highway overpass, a police spokeswoman said.
"An investigation is under way, but at the moment the causes of the crash are unknown," she said, adding that the bus had come from the southern Moroccan city of Tiznit.
Thirteen other passengers were slightly injured, and four had already left hospital. One of the two drivers was among those killed and the other was seriously injured.
Hundreds of thousands of Moroccans work in France and many regularly return home to see their families. (Reporting by Henri-Pierre Andre and Brian Rohan; Editing by Keith Weir)