Another six people were shot dead in an ambush in a restive city north of the capital, they said.
Security officials said a suicide bomber blew himself up in Jadida, a Shiite district of southern
In the second attack, a bomber slammed his explosives-filled car into an Iraqi military armoured vehicle at a checkpoint near a mosque in the nearby neighbourhood of Zafaraniyah, the officials said.
The blast killed four people, including three soldiers, and wounded 10 worshippers.
Six people were also killed when gunmen opened fire at a minibus near the city of
Diyala is one of the most dangerous provinces of and insurgents have managed to carry out attacks there despite heavy military crackdowns by security forces.
On Wednesday, four people were killed and 15 wounded in a car bomb attack at a mosque in Balad, north of
The bomb exploded in the car park of the Sayid Mohammed mosque in Balad in the Sunni
The latest wave of attacks came as the majority of Shiites in celebrated Eid, a day after Sunni Muslims began to mark the end of Ramadan.
has seen a downward trend in violence since the middle of last year, although bloodshed spiked in March and April during clashes between Shiite militiamen and US-led security forces.
In September, a total of 440 Iraqis were killed in militia and insurgent violence, including 359 civilians, 26 Iraqi soldiers and 55 policemen, according to figures from various ministries.
The death toll was little changed from 431 in August.
US and Iraqi officials claim that violence in the country is at a four-year low, but recent weeks have seen a slight spike in deadly attacks.
The first 21 days of Ramadan were the quietest fasting period in the Iraqi capital in three years, Major General Jeffery Hammond, the commander for
He said the period saw just 60 attacks compared with 600 in 2007 and 800 in 2006 — the year when sectarian violence erupted across .
"There has been a slight increase of violence in September," he said, adding that this was always the trend during Ramadan.
But the rise has not changed the overall declining trend, he said.