A haul of weapons has been located by police following reports of an industrial accident in Elland.
Two men are being held by police on suspicion of firearms offences following the incident which led to long traffic delays.
The area was temporarily evacuated as a precautionary measure while military experts ensured the safety of the items.
Calderdale Way re-opened at 7.55pm last night and the slip road was opened at 8.20pm.
Anyone with any information should contact Calderdale CID on 101.