Iran and Iraq announced raids on each other's capitals last night, while marine sources said warplanes struck a freighter in the Persian Gulf, killing one sailor and wounding another.

A powerful blast ripped through downtown Baghdad, the capital of Iraq, at about 11 p.m., and Iran's official Islamic Republic News Agency said Iranian forces had fired a long-range missile into the city, The Associated Press reported.

An Iraqi military spokesman said in a late broadcast over Baghdad radio that Iraqi warplanes "carried out the Iraqi response and raided Tehran twice at 11:45 p.m."

The target of last night's raids, Iraq said, was Tehran's Mehrabad Airport. The airport also was attacked late Friday, for the first time since the countries went to war in September 1980 in a border dispute.

There was no official word on any casualties in Baghdad or Tehran. The blast was the 10th reported in Baghdad in 2 1/2 months, while Iraq has reported making 32 raids on Tehran in that period.

Earlier, Iraq said its warplanes had attacked the border town of Gilan-e Gharb and two military camps in the latest escalation of fighting in the nearly 5-year-old Iran-Iraq war.

Lloyd's of London, the world's largest maritime insurer, said two rockets were fired into the 15,002-ton, Panamanian-registered container vessel Oriental Importer, leaving one crewman dead, another injured and two missing.