ISLAMABAD (AP) — An Iranian official began meetings Tuesday with mediators in Pakistan as diplomats sought to salvage the collapsed interim deal between Iran and the United States, even as both countries continued to launch attacks for a 10th day of renewed fighting.

The visit by Iran’s Interior Minister Eskandar Momeni comes as Pakistan has intensified diplomatic efforts in recent days to resuscitate the deal. However, it remains unclear just what new arrangement could be reached to end the fighting.

Iran attacked a tanker in the Strait of Hormuz early Tuesday, forcing its crew to abandon the ship, while the United States conducted yet another round of airstrikes targeting the Islamic Republic.

The 10 consecutive nights of U.S. airstrikes haven’t compelled Tehran to loosen its grip on the strait, through which about a fifth of all crude oil and natural gas traded once passed in peacetime.

The interim deal signed last month that was meant to end the fighting has crumbled. Shipping through the Strait of Hormuz has largely stalled. And as fighting intensifies, both sides have targeted civilian infrastructure relied on by millions of people.

“Iran and groups supportive of Iran may target other U.S. interests overseas or at locations associated with the United States and Americans throughout the world,” the U.S. State Department said in a new warning to Americans.

The escalation has pushed oil prices higher in recent weeks. Benchmark Brent crude traded Tuesday at nearly $90 a barrel and regular gasoline in the U.S. climbed to an average of $4 a gallon, keeping pressure on Americans’ wallets ahead of midterm elections this fall.

President Donald Trump took to social media on Monday to warn that “Every time Iran kills an American Soldier they will pay for that killing many times over!”

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Gambrell reported from Dubai, United Arab Emirates.