Another 50 people were wounded in one of the attacks close to a restaurant near Nasiriyah, said a senior provincial health official, Jassem al-Khalidi.
The first attack occurred outside a local restaurant and minutes later an explosives-packed vehicle rammed a security checkpoint in the same area, officials said.More news: UNSC approves tough new sanctions against N.Korea (Second Lead)
The Islamic State group was quick to claim responsibility for the attack on its official online Amaq publication. The death toll could rise, warned Abdel Hussein Al-Jabri, deputy director-general of health for province of Dhi Qar, which was state of wounded " in critical condition ".
Police sources said some police officers had died in the checkpoint attack, but the toll from that incident remained unclear.More news: Democrats introduce amendment to defund Trump's voting fraud commission
The Sunni extremist group regularly stages attacks in Iraq, where it has lost swathes of territory to US-backed pro-government forces.
At a roadside restaurant near Nasiriya, the capital of the Dhiqar province, gunmen stormed inside the property and opened fire, Iraqi interior ministry spokesman Brigadier General Saad Maan told the BBC.More news: Justice Department Requests Supreme Court Remove Travel Ban Exception Protecting Certain Refugees
Thursday's attacks come as Iraqi forces backed by tribal fighters closed in one of the last Daesh bastions in the country: Al Qaim area on the border with war-ravaged Syria. In short statement released by its propaganda organ Qama, organization wrote that several suicide bombers participated in this attack, which killed " dozens of shiites ".