SAN PEDRO SULA, Honduras -- In a new overture to Iran, the Obama administration has authorized U.S. embassies around the world to invite Iranian officials to Independence Day parties they host on or around July 4th.

A State Department cable sent to all U.S. embassies and consulates late last week said that U.S. diplomats could ask their Iranian counterparts to attend the festivities, which generally feature speeches about American values, fireworks, hot dogs and hamburgers.

The notice, sent on Friday, said that the posts "may invite representatives from the government of Iran" to the events, a State Department official said Tuesday, quoting from the document. The official spoke on condition of anonymity to discuss an internal communication.

It was not immediately clear how many embassies and consulates would actually invite Iranian diplomats to the July 4 parties or whether any Iranians would accept the invitations.

The cable was first reported by The New York Times.

The move comes amid the administration's ongoing efforts to engage Iran in variety of venues, including formal diplomatic meetings over its nuclear program, violence in Iraq and the situation in Afghanistan.

But Iran has given mixed responses to the overtures, which began early in the administration when President Barack Obama recorded a videotaped greeting to the Iranian people and its leaders for their new year.

Since then, the administration announced that it would be a full participant with Iranian officials in six-nation talks aimed at getting Iran to address concerns about its suspect nuclear program. The U.S. and others accuse Iran of trying to develop nuclear weapons.

Iran maintains it is only interested in a civilian atomic energy program and has refused to accept a package of incentives offered by the U.S. and its partners to get it to stop enriching uranium, a process that can produce the fuel for a nuclear weapon.

The U.S. also ensured that Iran was invited and attended an international conference on Afghanistan at which U.S. Secretary of State Hillary Rodham Clinton spoke and an Iranian official had a brief exchange with a senior American diplomat.

During that meeting in The Hague, U.S. delegates passed an informal note to Iranian officials seeking information about three Americans then missing or detained in Iran.

Last month, Iran released one of the Americans, Iranian-American journalist Roxana Saberi, who was tried and convicted of spying for the United States.

Obama and other U.S. officials have said they do not expect to see much movement from Iran until after the country holds presidential elections in the middle of the month, but have sketched a rough deadline of the fall by which they hope to see positive responses to their overtures.