On Monday, the Iranian Foreign Ministry rejected claims that it was responsible for an attack that killed three U.S. service members at a U.S. base in Jordan on Sunday.

U.S. officials said the drone attack near the Syrian border also wounded 34 American service members.

President Joe Biden said on Sunday that U.S. officials “know that radical militant groups backed by Iran in Syria and Iraq carried out the attack.” The U.S. was gathering information on Sunday.

Iranian ministry spokesperson Nasser Kanaani said on Monday that the allegations that Iran was behind the attack were a “repetition of unfounded accusations.”

Kanaani said, “The groups in the region are not under Iran’s command.” He added, “War is not the answer. A quick cease-fire in Gaza can bring back peace.”

John Kirby, spokesperson for the National Security Council, said on “Good Morning America” on Monday that Biden was considering various options for a response to the attack. He said the U.S. was aware that Iran has been backing Houthi, Hezbollah and Hamas militants in the region.

Kirby told ABC News’ George Stephanopoulos, “We don’t want a wider war in the region.” He also said, “We don’t want a confrontation with Iran.”

He continued, “But there is no doubt that Iran is supporting these groups. They’re funding them, training them, and certainly not stopping these attacks at all.”