Live: Suspect arrested in terror attack on French factory

A decapitated head, along with a flag in Arabic, has been found following an attack on a factory in southeast France Friday in which an assailant also rammed a car into the premises, triggering an explosion.

Here are the main developments so far:

A person rammed a car into the premises of a factory owned by US company Air Products in the town of Saint-Quentin-Fallavier, triggering an explosion.

Police have said a decapitated head was found at the site, along with a flag bearing Arabic writing, although there was uncertainty about how the man was decapitated and where. The head was also covered in Arabic writing, according to authorities and media reports.

Police said it was unclear whether the attacker was acting alone or had accomplices.

French Interior Minister Bernard said one suspect, named as Yassin Sahli, had been arrested, and police were holding other suspected accomplices.

The suspect had been under surveillance from 2006 to 2008 on suspicion of having become radicalised, but had no criminal record, said Cazeneuve.

French Prime Minister Manuel Valls has ordered tightened security measures on all “sensitive sites” in the region.

French President François Hollande, speaking in Brussels, described it as a “terrorist attack”. The French President has returned to Paris and is due to hold and emergency cabinet meeting Friday afternoon.