An American nuclear submarine has crossed the Suez Canal to join the US fleet stationed in the Persian Gulf, Egyptian sources say.

Egyptian officials reported that the nuclear submarine crossed the canal along with a destroyer on Friday and Egyptian forces were put on high alert when the navy convoy was passing through the canal.

An American destroyer recently left the Persian Gulf, heading towards the Mediterranean Sea; earlier Thursday, a US Navy rescue ship crossed the canal to enter the Red Sea.

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The deployment comes as recent reports allege that US Vice President Dick Cheney is seeking to rally the support of Middle Eastern states for launching an attack on Iran.

This is while US officials deny that Cheney's Mideast tour is linked to a possible military attack on Iran.

According to the latest reports, in recent months a major part of the US Navy has been deployed in and around the Persian Gulf.

The fleet is armed with nuclear weapons and cruise missiles and carries hundreds of aircraft and rapid reaction forces.