Two men, aged 35 and 37, have been charged in connection with the discovery of mortar bombs in a van in Derry city on Sunday night.
They are due to be brought before Derry Magistrates' Court tomorrow morning.
The men face a number of charges, including possession of explosives with intent to endanger life, possession of articles for terrorist purposes and conspiracy to cause an explosion.
The charges are to be reviewed by the Public Prosecution Service.
The PSNI said two other men, aged 31 and 37, have been released unconditionally.