The chilling last message of a terrorist "OK, we're ready" has been discovered on a mobile phone found at the scene of the Paris terror attacks.

The phone is believed to have been found in a bin outside the Bataclan theatre, where 89 people were killed by three gunmen, who then blew themselves up.

As well as the chilling text, it contained a detailed plan of the concert hall, where the Eagles of Death Metal band was playing.

Massacre: A French policeman assists a blood-covered victim near the Bataclan concert hall (
Image:
REUTERS/Philippe Wojazer)

The police have not yet been able to confirm which of the three terrorists the phone belonged to, but they said they were certain it was one of them, Mediapart reported.

The news came as Reuters reported French police are seeking a new suspect after video footage showed there were three men in a car used by the suspects.

Read more:Paris attacks: Brother of fugitive terror suspect Salah Abdeslam urges him to hand himself in to police

"Three men were in the black Seat used to fire on the bar terraces and restaurants," a judicial source said.

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The source said that investigators were now sure that alongside Salah Abdeslam, who is being sought by police, and his brother Brahim who blew himself up at the scene, there was a third man, whom they have yet to identify.

Victim: 89 people died in the Bataclan concert hall (
Image:
Getty Images)

"He is therefore being sought," a second source close to the investigation said.

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Seven gunmen and suicide bombers died in the attacks which killed at least 129 people in total in shootings and suicide bombings at the bars and cafes, suicide bombings at the Stade de France soccer stadium, and a machine gun slaughter at the Bataclan music hall.

Suspect: Salah Abdeslam, 26, is on the run (
Image:
Getty)

Islamic State, the militant Islamist group that claimed the attacks, said it sent eight men on their mission. Tuesday's news suggest there were nine.

A justice official told Reuters earlier that there may be further suspects on the loose. "We are in the process of determining how many there may have been. Nothing is ruled out."