An old bullet around 15cm was discovered near Cambridge railway station this morning.
The device forced an evacuation of the station and trains to be cancelled.
Services running through the station may be cancelled or delayed by up to 30 mins or revised, operator Abellio Greater Anglia said.
Disruption is expected until around 1pm today, though all lines have now reopened and the station is operating normally.
A spokesman for British Transport Police (BTP) said: “We were called to Cambridge station at 8.50am after workmen reported finding an unexploded device.
“Colleagues from Cambridgeshire Constabulary also attended and an object, which appears to be an old bullet around 15cm in length, was removed.
“The station was evacuated while the situation was assessed, but is now re-opening.”
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