By Ahmed Rasheed
BAGHDAD, March 8 (Reuters) - Iraqi security forces and Shi'ite militia fighting the Islamic State took control of the centre of a town on the southern outskirts of Saddam Hussein's home city Tikrit on Sunday, security officials said.
Sending in more troops and fighting fierce clashes, the army and militiamen were still struggling to drive out Islamic State militants entrenched in buildings in the western section of the town of al-Dour, officials said.
Military commanders said the army and militia, known as Hashid Shaabi (Popular Mobilisation) units, launched another offensive late on Saturday to break into the centre of al-Dour.
By Sunday they had succeeded in recapturing the central area where government headquarters are located, but Islamic State insurgents were still holding positions in the west.
"Daesh snipers are still targeting our troops from some of the high buildings. We should be able to take them out with helicopter attacks this evening," said Ahmed al-Yasiri, a Hashid Shaabi leader fighting in al-Dour. Daesh is the Arabic acronym for Islamic State.
Officials said security forces and Shi'ite militia fighters had also captured about third of the village of Albu Ajil south of Tikrit - hometown of the executed Sunni president.
Some Albu Ajil residents were accused by authorities and Shi'ite militia groups of taking part in the killing of soldiers from the nearby Speicher army camp when Islamic State fighters overran Tikrit and northern Iraq last June.
Shi'ite militia fighters have described the advance on Albu Ajil as revenge for the Speicher killings, although militia leaders say all civilians in the Sunni Muslim region will be well treated.
The campaign to retake Tikrit is the biggest offensive so far against Islamic State insurgents. If successful, it would be the first time the army and militia have recaptured a major city from the militants.
Progress in the offensive, which was launched a week ago, could also affect the timing and strategy for a wider offensive later this year to retake Mosul, the largest city under Islamic State control.
A U.S.-led coalition has supported Baghdad's fightback against Islamic State with air strikes, military training and equipment. But the main support on the ground for the Tikrit operation has come from Iranian commanders and Iran-backed militias.
Elsewhere in Iraq, a bomb exploded near a busy street in Baghdad, killing at least four people in the predominantly Shi'ite Talbiya neighbourhood in the east of the capital, police and medical sources said.
In the mainly Shi'ite district of Hussainiya in the northern outskirts of Baghdad, a bomb went off near a restaurant, killing three people.
Another bomb hit a busy street and killed two passers-by in Madaen, a town 30 km (20 miles) southeast of Baghdad.
A parked car bomb exploded in Mahmoudiya, a predominantly Shi'ite town south of Baghdad, killing three civilians and wounding 17, police and medical sources said.
(Editing by Dominic Evans and Clelia Oziel)
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