Oman's foreign ministry said on Sunday that it condemns attacks on its territory, adding that no party has claimed responsibility.
It said authorities were investigating the attacks' "sources and motives" without providing further details or specifying any specific attack.
Oman said on Saturday that a worker was injured in a drone attack on the Gulf country's Salalah port and Danish container shipping group Maersk said later that it temporarily halted its operations at the port after Saturday's attack.
Iran's Revolutionary Guards said on Saturday that they targetted a US support vessel at a "considerable" distance from Salalah port, Iranian media reported. "As we have previously stated, the national sovereignty of our brotherly and friendly country Oman is respected by the Islamic Republic of Iran," it added.
On March 11, drones struck oil storage facilities at Salalah port. Iranian President Masoud Pezeshkian told Oman's sultan in a phone call that the incident would be investigated.

Quakes rock Venezuela, killing at least 32 and injuring hundreds
Trump asks Congress for more funds to fight Iran, defying rebuke on war powers
Magnitude 6.9 quake strikes Japan's northeast, no tsunami warning
US, Iran at odds on nuclear inspections, frozen assets in deal to end war
Oman establishes temporary shipping corridor through Strait of Hormuz
