Breaking: 1 dead in France terror attack, severed head found with message.

One person has been beheaded and two people injured in a terrorist attack at a gas factory in southeastern France, French President Francois Hollande said Friday.

In a televised address from a summit in Brussels, Belgium, he called the incident a "pure terrorist attack."

Hollande said a body had been found, along with a severed head with a message.

A suspect has been arrested and identified, he said, and a large contingent of police has secured the site.

The attack took place just before 10 a.m. local time (4 a.m. ET), he said, when a vehicle was driven at high speed into the factory site and into a building housing gas canisters.

"There is no doubt that the intention was to provoke an attack, an explosion," he said.

Hollande expressed his condolences and solidarity with the victims of the attack.

French news agency AFP earlier reported that a suspected Islamist attacker pinned a severed head covered with Arabic writing to the gates of the factory

A source cited by BFMTV also said a severed head had been put in front of the company, next to which was found an Islamist flag. CNN has not been able to confirm the report independently.

A man described as a witness, whose name was given as Patrice, also told BFMTV that a group of men carrying Islamist flags forced their way into the factory, beheaded a person and targeted gas tanks.

Le Monde newspaper cited unidentified sources as saying that two people rammed a vehicle into the building, causing the explosion. Banners in Arabic that haven't yet been examined were found at the scene, the paper added.

The Paris prosecutor's office said its anti-terrorist section was opening an investigation into the attack.

It is investigating possible murder and assassination attempts by organized gangs in relation to a terrorist enterprise; destruction and degradation resulting from explosive materials by organized gangs in relation to a terrorist enterprise; and terrorist conspiracy to commit crimes against people, the Paris prosecutor's office said in a statement.

culled from CNN