U.S. investigators have found out that a U.S.-made missile designed for assassinations was used in the attack on the presidential palace earlier this month that injured President Saleh, Alarabiya website reported on Tuesday.

The investigators also said that the missile is a 'very advanced product' used only in the U.S. and Russia, the website said.

"The U.S. probe team informed the Yemeni authorities about the finding," it said, a day after a Saudi paper reported that one of the senior officials who were injured in the attack had been buried in Saudi Arabia.

Several senior officials were injured in the attack on the presidential palace in Sana'a that also killed eleven of Saleh's guards.

However, Aloula newspaper quoted a Yemeni official as saying that the missile an advanced Russian rocket. "The guided missile held a Russian name, FOGAZ," the paper said.

A team from a U.S. non-government firm is currently investigating the attack without any help from the FBI, it added.

The finding refutes previous U.S. and Yemeni conclusions that President Saleh was attacked from inside his compound by artillery or tank missiles.

"The missile that landed in the presidential palace during Friday prayers was designed for targeting heavily-guarded personalities, not buildings or other targets," the U.S. investigators were quoted as saying.