Parts of St Helens have been brought to a standstill after an unexploded shell was found by workmen digging up a road.
Engineers working on the Knowsley Expressway found the device at around 11.30am today at the junction of the Expressway and Speke Road.
They reported their suspicions to the police who closed the road while an investigation was carried out.
A force spokesman said: “Police officers have closed the Knowsley Expressway (southbound only) from Tarbock Island, where it meets junction 1 of the M57 down to its junction with Speke Road (the A562).
“The northbound carriageway of the Knowsley Expressway remains open at this time and motorists can still join it from Speke Road to head north towards Tarbock Island and the M62 and M57 motorways.
“Speke Road is also unaffected and remains open in both directions.
“The incident with the unexploded ordnance remains on going and specialist police officers are working alongside experts from the Royal Logistical Corps (EOD) to carry out further examinations of the device.
“Motorists should avoid the area where possible and follow diversions and advice from police officers at scene if they are already on the affected roads.”