Some were known as "privateers." They were given special letters by the British government to attack the ships of enemy nations.

VOA: special.2009.05.27

Rahall said he doubts that senators would mount a strong attack on special projects in conference and would instead focus on pushing their own projects.

CNN: By Alan K. Ota, CQ Staff Writer

The U.S. military also blamed that attack on a Special Groups cell, but Stover couldn't say whether it was connected to Tuesday's blast.

CNN: U.S. Embassy staff, soldiers killed in Baghdad blast

With many diseases, the immune system is able to recognise the invading bacteria as foreign and launch an attack, sending special defence cells to latch onto and destroy.

BBC: Find boosts cancer vaccine hopes