A suicide bomber blew himself up at a military recruiting center in Baghdad on Thursday, killing at least 26 people and wounding 42 others.The blast struck as an international rights group warned of the apparent use of indiscriminate mortar fire in civilian areas by Iraqi forces in their campaign to reassert control over the cities of Fallujah and Ramadi.A security source told KUNA that this is the final tally according to the Kathmiyah and Yarmouk hospitals.In a related development, five soldiers were killed and three others wounded in a bomb explosion that targeted a patrol of the Iraqi army in Tikrit. Three other soldiers were also wounded when a bomb exploded in Samarra that targeted the Iraqi army personnel.In Baqouba east of here, a civilian was killed as he blew himself up with explosive-laden vehicle.In Mosul, two people were killed, a polican and a civilian, in two separate attacks.