(KUNA) -- The Multinational Forces (MNF) arrested five gunmen Saturday in the northern city of Tikrit relying on the same intelligence that led to the killing of Al-Qaeda former leader, Abu Musab Al-Zarqawi The US Army said in a statement today that one of the arrested gunmen had direct links with Al-Qaeda and played a significant role in insurgent operations in the cities of Baqouba and Tikrit.The MNF used hand grenades to secure the building where the gunmen hid and then arrested them without any serious losses, said the US Army. The statement noted that the MNF mistakenly arrested one of the area's Sheikhs, but released him shortly after revealing his identity. The US Army also said in a statement the Iraqi army arrested Ali Al-Najar, the head of an assassin-squad, in the southern Iraqi city of Diwaniya last Wednesday. The statement said that Al-Najar was directly responsible for the assassination of several figures and mortal-shell attacks on MNF in Diwaniya.