A resurgence of violence and a renewed threat from al-Qaida have recently revived flagging US interest in Iraq, as Baghdad asked for new help to fight extremists less than two years after it forced American troops to withdraw.

Faced with security crises across the Mideast, North Africa and Asia, the White House largely has turned its attention away from Iraq since US forces left in 2011. But the country has been hit with deadly bombings at a rate reminiscent of Iraq's darkest days, stoking new fears of a civil war. More than 1,000 Iraqis were killed in terror-related attacks in July, the deadliest month since 2008.

The violence has spurred Baghdad to seek new US aid to curb the threat, said Iraqi Foreign Minister Foreign Minister Hoshyar Zebari. He said a US assistance package could include a limited number of advisers, intelligence analysis and surveillance assets — including lethal drones.

He described US interest in Iraq after the 2011 troop withdrawal as "indifferent, completely" but said that seemed to shift as the White House realized al-Qaida's resurrection there.

The American troops left Iraq in December 2011 as required under a 2008 security agreement. Both countries tried to negotiate plans, but failed, to keep at least several thousand US forces in Iraq beyond the deadline to maintain security. But the proposal fell through after Baghdad refused to give the troops immunity from legal charges, as Washington demanded.

Nearly 4,500 US troops were killed, and American taxpayers spent at least $767 billion during the nearly nine years of war in Iraq.

Zebari attributed the insurgency's comeback to its partnerships with al-Qaida fighters in neighbouring Syria and outlawed Baath Party extremists in Iraq's south. Intelligence experts have described the terror group's footing in Iraq and Syria as a new al-Qaida hub in the Mideast, one that has sought for years to underscore Baghdad's inability to protect its people.

Most of the attacks in Iraq target government officials, security forces and Shiite pilgrims and neighborhoods. A senior US administration official this week said the number of suicide bombings in Iraq has more than tripled over the last months, and it's believed that most of the attackers are coming from Syria.

Distracted by a civil war in Syria, a policy pivot to Asia, growing extremism in North Africa and Iran's nuclear ambitions, the White House put Iraq on the back burner.

Egypt, once reliably stable, has disintegrated over deadly street riots and attacks that killed more than 600 people this week during protests over the ouster of Egyptian President Mohammed Morsi. Jordan, a key US ally, is threatening to collapse under financial strain caused, in large part, by more than 1 million refugees who have crossed into the country from Syria. The US is also leading peace talks between Israel and Palestinian authorities, and watching a growing threat from al-Qaida in the Arabian Peninsula in Yemen. A threat from al-Qaida led to the closing of 19 diplomatic posts across the region and in Africa last week.

In the 20 months since the troop withdrawal, the US has sought to stay out of Iraqi affairs and engage with its government as Washington would with any other nation. A majority of Americans agreed with that approach, and 58 percent of U.S. adults said in a Washington Post-ABC poll taken in March that the Iraq war had not been worth the fight.

Still, US officials say they remain actively involved in Iraq, and have quietly stepped up diplomatic efforts since March, when U.S. Secretary of State John Kerry visited Baghdad for the first time in his new post. They largely have focused on ensuring Sunni Muslims are included in Iraq's Shiite-led government, and have urged Shiite leaders to resist retaliating to the Sunni insurgency's attacks.

But the engagement also has centred on making sure Iraq's government remains independent from the Shiite government in Iran and staying out of the civil war in Syria, where Sunni Muslim rebels are seeking to overthrow Syrian President Bashar Assad, an Alawite. Alawites are an offshoot of Shiite Islam.