The Belgian government's crisis centre confirmed on Tuesday night vandals had set cars ablaze in the cities of Antwerp, Ghent and Brussels. It is the third night in succession that cars have been torched, but a spokesman for the national crisis centre said each case was an "isolated" incident."There were no injuries and there was no certainly no gathering [of youths]. The culprits cannot yet be found," spokesman Fernand Koekelberg said. "We hoped that [the initial incidents on Sunday night] were isolated cases, but apparently it's continuing," police spokesman Albert Roossens said earlier on Tuesday.