(Daily Mail) — Four U.S. soldiers were killed by a suicide bomber today as they took pictures and went sightseeing in an Afghanistan park.

Witnesses said the bomber walked up to the troops, who had been warned by locals ‘not to roam around the city’, screamed ‘Allahu Akbar’ and then detonated a suicide vest.

Four civilians and two Afghan policemen were also killed in the midday explosion in the northern city of Maymana.

Graphic video footage of the scene of the attack, available on YouTube, showed what appeared to be dead Afghan civilians, police and foreign troops at the explosion site.

Body parts were strewn around the gate and on the ground, and blood was spattered everywhere.

Faryab is relatively calm, but considered to be a stronghold of the Islamic Movement of Uzbekistan, or IMU, an Al Qaeda affiliated group most active in the northern provinces of Afghanistan.