Terror probe launched as France on red alert for further attacks.

A British grandfather who helped subdue a gunman armed with an AK-47 on a train from Amsterdam to Paris is to be presented with France’s top honour for bravery.

Three US citizens and a Briton who on Friday helped disarm a gunman on a train from Amsterdam to Paris, are to be awarded France’s highest honour.

The man who boarded a high-speed Amsterdam-to-Paris train with a Kalashnikov rifle before being tackled by passengers had ties to radical Islam and may have travelled to Syria.