US and Iraqi soldiers secure the site of a car bomb in Baghdad's Al-Shuala neighbourhood. A wave of attacks across Iraq on Sunday killed dozens people, while insurgents bombarded Baghdad's heavily fortified Green Zone with mortar fire, sending US embassy staff scurrying into bunkers. (Xinhua/AFP Photo)

A new wave of attacks across Iraq on Sunday killed at least 32 people and wounded more than 70, while insurgents fired barrages of rockets on the US-protected Green Zone area in Baghdad.

Of Sunday's bloodshed, the deadliest occurred in the northern city of Mosul, where a suicide bomber drove his explosive-laden truck into an Iraqi Army base at about 7:00 A.M (0400 GMT) local time in the Haramaat neighborhood in western of the city, killing 13 soldiers and wounding 30 others, a local security source told Xinhua.

He added that 12 civilians were also wounded by the powerful blast which damaged several nearby houses.

The suicide bomber truck breached the outer checkpoint of the military base and thrusted into the base, the source said. An armored vehicle at the entrance of the base failed to stop the attacker, he added.

US and Iraqi troops are preparing for an all-out offensive against the al-Qaida in Iraq fighters in Mosul, which according to Iraqi officials and US commanders is one of al-Qaida's last urban strongholds in Iraq.

In Baghdad, gunmen in three cars opened fire randomly at a crowded area in the Zaafaraniyah neighborhood, south of the capital, killing seven people and wounding 16 others, police said.