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Witnesses described a "bloodbath" following the horrific attack which left one people seriously injured.

Screaming passengers ran for their lives after a 34-year-old man started knifing people at random shortly before 2pm local time (noon BST).

One witness said the bus driver was attacked but managed to open the doors to allow those on board to flee.

Another witness said: "One of the victims was just offering his seat to an elderly lady when the attacker stabbed him in his chest. It was a bloodbath!"

Passengers said the suspect dropped a backpack before beginning the attack, which witnesses said began “smoldering”.

Explosives experts have since confirmed the bag contained a "fire accelerant" but no bomb.