It was not a bomb threat. Apparently a bag was tested for explosive residue and came back positive. The owner of the bag could not be found. It was later found that the pax who the bag belonged to had left on a flight to Paris the night before(with AF
I assume) and had left that bag behind by accident. The pax is a construction worker which would explain the explosives residue. Once that was sorted out, T1 reopened.