W.Africa pirates adapt after Nigeria crackdown

* Pirates move to less patrolled waters, further offshore
* Threat to Gulf of Guinea shipping seen growing
* International coordination needed to combat piracy - US
By Richard Valdmanis and Jonathan Saul
DAKAR/LONDON, Sept 21 (Reuters) - Nigerian pirate gangs are moving into the waters of neighbouring countries and attacking vessels further offshore after being driven from their coastal haunts by a military crackdown.
The shift to deeper waters mirrors one by their better-known Somali

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