Another pirate attack has been thwarted by the use of a safe room - this time off Nigeria.

 

The IMB said armed raiders boarded an unnamed Greek tanker anchored off Lagos on Friday.
 

The 23 crew managed to lock themselves away and sent out a distress call received by the IMB's piracy reporting centre in Malaysia.
 

It alerted the Nigerian navy and other warships patrolling the area.
 

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