Formation of new gangs, the re-emergence of old ones and adrying up of funds could all be to blame for the surge in activity during thepast three months, a new report suggests.

Bergen Risk Solutions counts 39 vessels and coastal craftattacked since early December 2012 in Nigerian waters, with a high level of violenceleading to seven deaths.

The period has also seen 33 people taken hostage andpotentially the first use of a hijacked offshore vessel - The 499–gt Armada