Iraq declared victory over the Islamic State Saturday after its forces drove out the group from its final area of control along the Syrian border, Prime Minister Haider al-Abadi told a conference in Baghdad.

"Our heroic armed forces have now secured the entire length of the Iraq-Syria border," Abadi later tweeted. "We defeated Daesh through our unity and sacrifice for the nation. Long live Iraq and its people."

The U.S.-led military coalition has marked a string of successes in its fight against ISIS, including the liberation of Raqqa, Syria, and Mosul, Iraq. But the force says that its artillery and airstrikes have killed at least 801 civilians in those countries since Operation Inherent Resolve began in 2014.

Updated at 10:30 a.m. ET

The Islamic State is claiming responsibility for Tuesday's vehicle attack in New York City that killed eight people and injured a dozen others.

The extremist group did not provide evidence of its involvement in the attack, but in a weekly issue of its Al-Naba newsletter, it claims that "the attacker is one of the caliphate's soldiers."

The Trump administration is pushing back against a growing bipartisan push for Congress to pass a new measure authorizing the use of military force against ISIS, Al-Qaida, and other terror groups.

Hussein Malla / AP Photo

This week on “Two Way Street,” Lawrence Wright joined us in front of a live audience at the Atlanta History Center to discuss his new book, ”The Terror Years: From al-Qaeda to the Islamic State.”

Attackers in the Afghan capital attempted to storm the Iraqi Embassy on Monday, setting off a bomb before gunmen rushed the compound's gate. The Islamic State has claimed responsibility.

NPR's Diaa Hadid, reporting from Islamabad, says the attack is likely in retaliation for Iraqi security forces routing ISIS fighters from their stronghold in Mosul, Iraq.

"The group is trying to assert itself – through violent attacks – to show its followers that it still has power, despite losing important battles in Iraq and Syria," she says.

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Iraqi forces have opened what they hope will be the final assault to retake Mosul, pushing into the the crowded, narrow lanes of the area still occupied by ISIS. The operation, launched at dawn Sunday after a barrage of airstrikes from the U.S.-led coalition, aims to retake Mosul's Old City from the militant group.

The Russian Defense Ministry says it may have killed ISIS leader Abu Bakr al-Baghdadi in a late May airstrike on an ISIS meeting in Raqqa, Syria. But the development has not been confirmed, Russian officials said Friday. In recent years, previous reports of Baghdadi's death have proved inaccurate.

"So far, I have no 100 percent confirmation of this information," Russian Foreign Minister Sergey Lavrov said, according to state-run Tass media, hours after defense officials posted a notice about the May 28 attack.

U.S.-backed fighters have launched an operation to try to seize control of ISIS' so-called capital, the city of Raqqa in northern Syria.

Raqqa is the most important stronghold for the militant group in Syria and fell under its control in 2014. Together with the ongoing fight for Mosul in Iraq, seizing control of the city is seen as a crucial goal in the fight against ISIS.