A crash has blocked the A55 in Gwynedd causing major delays.

Emergency services are at the scene between junctions 11 and 12.

A Traffic Wales tweeted just before 2.30pm: "A55 eastbound between J11 Llandygai & J12 Tal y Bont. Lane 1 closed. Traffic Officers attending."

Inrix traffic monitoring system said: "One lane closed and heavy traffic due to accident on A55 North Wales Expressway Eastbound from J11 A5 (Llandygai / Bethesda) to J12 Tal Y Bont Interchange."

UPDATE: Traffic was temporarily held but has now been released. Lane one remains closed.

More updates as we have them.