The Trump administration intensified its focus on Iran Sunday as the likely culprit behind attacks on important Saudi Arabian oil facilities over the weekend, with officials citing intelligence assessments to support the accusation and President Trump warning that he was prepared to take military action.

The government released satellite photographs showing what officials said were at least 17 points of impact at several Saudi energy facilities from strikes they said came from the north or northwest. That would be consistent with an attack coming from the direction of the northern Persian Gulf, Iran or Iraq, rather than from Yemen, where the Iranian-backed Houthi militia that claimed responsibility for the strikes operates.

Administration officials, in a background briefing for reporters as well as in separate interviews on Sunday, also said a combination of drones and cruise missiles — “both and a lot of them,” as one senior United States official put it — might have been used. That would indicate a degree of scope, precision and sophistication beyond the ability of the Houthi rebels alone.

Mr. Trump, however, did not name Iran, saying he needed to consult with Saudi Arabia first.

“Saudi Arabia oil supply was attacked,” he said in a tweet on Sunday evening. “There is reason to believe that we know the culprit, are locked and loaded depending on verification, but are waiting to hear from the Kingdom as to who they believe was the cause of this attack, and under what terms we would proceed!”

Secretary of State Mike Pompeo said Saturday that Iran was behind what he called “an unprecedented attack on the world’s energy supply” and asserted that there was “no evidence the attacks came from Yemen.” He did not, however, say where they came from, and the Saudis refrained from directly blaming Iran.