World Bulletin/News Desk

In response to a U.S. State Department report accusing Tehran of increasing its support for terrorism overseas to levels not seen for two decades, Tehran said it is the United States that backs terrorists in the Middle East.

"Iran has been actively engaged in counterterrorism activities by all possible means and is a party to many counterterrorism international legal instruments," said Alireza Miryousefi, spokesman for Iran's U.N. mission..

Last July, Iran's U.N. ambassador denied his country's involvement in the Bulgaria bombing, which he accused Israel of carrying out. "We have never, and will not, engage in such a despicable attempt on ... innocent people," Ambassador Mohammed Khazaee said.

"It should be mentioned that the U.S. government has no merit to label other nations of sponsoring terrorism as it has a long ... record (of) supporting terrorist groups in our region as well as Israeli state terrorism," Miryousefi said.

He cited the recent removal from the U.S. list of terrorist organizations of the Mujahadin-e-Khalq, a dissident group that calls for the overthrow of Iran's Shi'ite Muslim clerical leadership and fought alongside the forces of Iraq's late Sunni Muslim dictator Saddam Hussein in the 1980-88 Iran-Iraq war.

"The recent delisting of the MEK terrorist group ... and also allowing it to publicly lobby in Washington is a clear indication that the U.S. government has double standards in dealing with terrorism and uses designation of others as terrorist only to serve its illegitimate political interests," he said.

U.S. and European officials and intelligence agencies say Iran and Hezbollah have stepped up their military backing for the besieged government of Syrian President Bashar al-Assad.