TEHRAN, Iran — Iran test-fired more long-range missiles overnight in a second round of exercises meant to show that the country can defend itself against any attack by America or Israel, Iranian state television reported Thursday.

The weapons have “special capabilities” and included missiles launched from naval ships in the Persian Gulf, along with torpedoes and surface-to-surface missiles, the broadcast said. It did not elaborate.

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A brief video clip showed two missiles being fired simultaneously in the darkness.

The report came hours after Secretary of State Rice warned Iran that Washington will not back down in the face of threats against Israel.

“We are sending a message to Iran that we will defend American interests and the interests of our allies,” Ms. Rice said today at Georgia at the close of a three-day Eastern European trip.

Among the missiles Iran said it tested yesterday was a new version of the Shahab-3, which officials have said has a range of 1,250 miles and is armed with a 1-ton conventional warhead.

That would put Israel, Turkey, the Arabian peninsula, Afghanistan, and Pakistan all within striking distance.

Yesterday’s missile tests were conducted at the Strait of Hormuz, a strategic waterway at the mouth of the Persian Gulf through which up to 40% of the world’s oil passes. Iran has threatened to shut down traffic in the strait if attacked.

Another Iranian state channel, Press TV, quoted a senior Republican Guard commander today as saying Iran would maintain security in the Strait of Hormuz and the larger Gulf.

The chief of the Guards’ joint staff, General Mohammad Hejazi, called the missile tests a “defensive measure against invasions,” according to the channel’s Web site.

Iran will not jeopardize the interests of neighboring countries, he said without elaborating.

Oil prices jumped on news of yesterday’s tests, rising $1.44 to $137.48 a barrel in electronic trading on the New York Mercantile Exchange.