U.S. forces struck 90 Iranian military targets overnight, Central Command said.
President Donald Trump announced "major combat operations" against Iran on Feb. 28, with massive joint U.S.-Israeli strikes targeting military, government and infrastructure sites.
Delegations from the U.S. and Iran entered negotiations last month aimed at a war-ending deal based on a memorandum of understanding signed by both countries.
The U.S. and Iran nonetheless exchanged limited strikes in late June despite the signing of the memorandum and amid the continuation of peace talks.
Iran fired at least two missiles at commercial vessels transiting the Strait of Hormuz overnight, two U.S. officials told ABC News on Tuesday.
The statement followed the report by the U.K. Maritime Trade Operations Centre of an "unknown projectile" striking a tanker off the Omani coast Early on Tuesday.
-ABC News' Shannon K. Kingston and Katherine Faulders
An "unknown projectile" struck a commercial tanker off the coast of Oman early on Tuesday, the U.K. Maritime Trade Operations Centre said.
The tanker, which was not identified by name, caught fire after the strike, UKMTO said in a warning posted on social media.
The ship had been traveling southbound about 8 nautical miles off the coast of Limah, Oman, the organization said.
"No casualties or environmental impact reported," UKMTO said.
-ABC News' Joe Simonetti
The body of slain former Supreme Leader Ali Khamenei has arrived in Qom, Iran, where his funeral procession is expected to continue Tuesday, according to Iranian state TV.
This comes after thousands of mourners gathered in the streets of the Iranian capital of Tehran Monday to honor Khamenei, who was killed in joint U.S.-Israeli airstrikes on Feb. 28.
Iranian state TV showed a photo of former Iranian President Mahmoud Ahmadinejad at the funeral procession.
Following Qom, funeral events will continue in the cities of Najaf and Karbala in Iraq.
-ABC News’ Desiree Adib
Photos and videos from Tehran showed thousands of mourners thronging the streets of the Iranian capital as the dayslong funeral for slain former Supreme Leader Ali Khamenei continued on Monday.
Khamenei was killed in joint U.S.-Israeli airstrikes on Tehran in the opening hours of the conflict with Iran in on Feb. 28.
Khamenei's funeral began on Saturday. His body will be taken to Qom, Najaf and Karbala -- the great Shi'ite centers of Iran and Iraq -- before being laid to rest on Thursday in Mashhad, home to the country's holiest pilgrim shrine.
