A cleaner who saw the blast, said: "Five died. I could not count the wounded. They were all women who were cleaning the streets.
"We will stop the clean-up exercise. No one is willing to die for cleaning the street."
Another witness described an "ugly scene".She said: "I could not count the dead. I just glanced immediately and ran away for my life."
A senior policeman in the north said assailants armed with machine guns, rocket-propelled grenades and artillery mounted on trucks attacked police in Horuwa, an Islamic courts stronghold where interim government troops have been repeatedly attacked since last week.
He said: "They attacked the policemen thrice and were repulsed every time they attacked."No policeman was killed or wounded... This was the heaviest attack on our forces since a curfew was imposed last Friday."
Daily attacks