Afghan troops backed by NATO troops recaptured Musa Qala from Taliban forces in December.
The group was traveling from central Helmand to Musa Qala to inaugurate a newly built mosque in the district.
The attack came in Musa Qala's main market, Chief Mohammad Hussain Andewal said.
One resident of Musa Qala, Haji Sarfaraz, told the BBC's Pashto Service that life was now returning to normal there.
The provincial police chief of Helmand, Gen Mohammad Nabi Malakhel, told the BBC the Afghan government's writ still ran in the Musa Qala area.
KABUL, Afghanistan (CNN) -- A suicide attacker detonated his explosives Sunday in Musa Qala, killing himself and four civilians, the Helmand province police chief said.
Somerset-based 40 Commando was the first marine unit to serve in Afghanistan in 2001 - with missions in areas including Sangin, Nahr-e Saraj and Musa Qala.
In 2007, the British managed to bring a Taliban commander, Mullah Abdul Salam Zaeef, over to their side and made him governor of the Musa Qala district.
Basra and Musa Qala not to mention the capture of British sailors and marines at sea by the Iranians in March 2007 have fed American worries about British forces.
The inquest heard that Pte Hunt was driving one of the Warriors, a task he disliked but did without complaining, towards Musa Qala, Helmand, when it hit an improvised explosive device (IED).
In previous tours in 2009, the battalion lost Lance Corporal Chris Harkett when he was killed by an improvised explosive device (IED) as he provided covering fire on a Taliban stronghold near Musa Qala.
Marines from 40 Commando took on responsibility for Battle Group North in Helmand Province from last September until this April, where they operated from spartan forward operating bases in the Gereshk and Sangin valleys, often taking part in fierce gun battles with the Taliban, and playing a key role in the recapture of the town of Musa Qala.
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