About 140 US military personnel have been wounded in attacks since the start of the war against Iran, the Pentagon said on Tuesday.

"The vast majority of these injuries have been minor, and 108 service members have already returned to duty," Pentagon spokesman Sean Parnell said in a statement.

"Eight service members remain listed as severely injured and are receiving the highest level of medical care," he added.

Seven US military personnel were also killed in Iranian attacks early in the conflict -- six in Kuwait and one in Saudi Arabia -- the US military has previously said.

US and Israeli forces launched a massive air campaign against Iran on February 28, and Tehran responded with waves of missiles and drones targeting countries in the region that host US forces or bases.

Pentagon chief Pete Hegseth said earlier Tuesday that US strikes against Iran were intensifying, while the volume of drones and missiles launched by Iran has dramatically decreased.