FILE - In this March 20, 2019 file photo, Acting Defense Secretary Patrick Shanahan speaks at the Center for Strategic and International Studies in Washington. Shanahan is set to deliver the commencement address to the 2019 graduating class of the U.S. Naval Academy. The former Boeing executive will speak Friday, May 24, 2019, at the Navy-Marine Corps Memorial Stadium in Annapolis. (AP Photo/Andrew Harnik, File)
FILE - In this March 20, 2019 file photo, Acting Defense Secretary Patrick Shanahan speaks at the Center for Strategic and International Studies in Washington. Shanahan is set to deliver the commencement address to the 2019 graduating class of the U.S. Naval Academy. The former Boeing executive will speak Friday, May 24, 2019, at the Navy-Marine Corps Memorial Stadium in Annapolis. (AP Photo/Andrew Harnik, File) Credit: Andrew Harnik

WASHINGTON — The U.S. will send hundreds of additional troops and a dozen fighter jets to the Middle East in the coming weeks to counter what the Pentagon said is an escalating campaign by Iran to plan attacks against the U.S. and its interests in the region.

And for the first time, Pentagon officials on Friday publicly blamed Iran and its proxies for recent tanker bombings near United Arab Emirates and a rocket attack in Iraq.

President Donald Trump told reporters on Friday that the 1,500 troops would have a “mostly protective” role as part of a build-up that began this month in response to what the U.S said was a threat from Iran, without providing details or evidence.

Vice Admiral Michael Gilday told Pentagon reporters that the U.S. has “very high confidence” that Iran’s Revolutionary Guard was responsible for the explosions on four tankers, and that Iranian proxies in Iraq fired rockets into Baghdad. He said Iran also tried to deploy modified small boats that were capable of launching cruise missiles.

The deployments announced on Friday include a squadron of 12 fighter jets, manned and unmanned surveillance aircraft, and a number of military engineers to beef up protection for forces.

In addition, a battalion of four Patriot missile batteries that were scheduled to leave the Middle East has been ordered to stay. The total number of troops involved is about 1,500, with roughly 600 included in the Patriot battalion.

Trump has in recent weeks alternated between tough talk toward Iran and a more conciliatory message, insisting he is open to negotiations with the Islamic Republic. He seemed to downplay the prospect of conflict when he spoke at the White House.

“Right now, I don’t think Iran wants to fight and I certainly don’t think they want to fight with us,” he said.

Briefing reporters at the Pentagon, Gilday, the Joint Staff director, did not provide direct evidence to back up claims tying Iran to the attacks.

He told reporters the conclusions were based on intelligence and evidence gathered in the region, and officials said they are trying to declassify some of the information so that it could be made public.

“This is truly operations driven by intelligence,” Gilday said, adding that the U.S. continues to see intelligence suggesting that Iran is actively planning attacks against the U.S. and partners in the region by the Revolutionary Guard and Iranian proxies in Yemen and Iraq.