Here's why the Royal Navy will be sounding the nuclear siren in Portsmouth this morning

THE Royal Navy will be testing a nuclear alarm but residents have been told not to worry.

By Steve Deeks

Published 26th Jun 2019, 10:05 BST

Updated 26th Jun 2019, 11:35 BST

The nuclear siren will be tested on the base this morning at 9.30am.

The two-tone site-wide siren will be sounded for one minute.

‘No action is to be taken,’ the Royal Navy said on its Twitter feed.

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