Britain's defense ministry says it is dealing with a security "incident" at the Royal Navy warfare school in southern England, days after letter bombs were sent to several army facilities.

The Ministry of Defense gave no details on the incident Monday at HMS Collingwood, saying it was "ongoing."

Hampshire Police said officers had been sent to HMS Collingwood after reports of a package being discovered.

Last week seven letter bombs — containing gun powder, fuses and other parts — were sent to army recruiting centers in southern England.

The government said the envelopes bore the hallmarks of Irish Republican Army dissidents, who are already linked to failed October letter-bomb attacks in Northern Ireland.