The La Liga leader was unhappy that the official failed to stop play during the quarterfinal first leg tie while Javier Mascherano and Jordi Alba were both left prostrate following a collision in the penalty area.

CNN: Tottenham frets over Bale blow

Officers are particularly interested in speaking to the driver of a red lorry seen in the area prior to the collision.

BBC: Three arrested in Norfolk after fatal crash near Diss

Four years ago, some 18 people were killed and dozens injured in a collision between two passenger trains in the Giza area.

BBC: Cairo train derailment leaves 19 dead