A security incident is "ongoing" at the Royal Navy's warfare school, the Ministry of Defence has confirmed.
A spokesman said there was an ongoing incident at HMS Collingwood in Fareham, Hampshire, but said it would be inappropriate to comment further.
It is believed that the incident could involved a suspect package, but reports have not been confirmed by the MoD.
A spokesman said: " We can confirm that there is an ongoing incident at HMS Collingwood, the Royal Navy warfare school in Fareham, Hampshire.
"It would be inappropriate to comment further at this stage and all queries should be referred to the Hampshire Police."
HMS Collingwood is the headquarters of the navy's Maritime Warfare School and Surface Stream, delivering training including weapon engineering, diving, physical training, chemical biological radiation nuclear and damage control, sea survival, seamanship and military skills.