WASHINGTON -- CIA security officers went to the aid of State Department staff less than 25 minutes after they got the first call for help during the attack on the U.S. Consulate in Benghazi, Libya, U.S. intelligence officials said yesterday as they laid out a detailed timeline of the CIA's immediate response to the attack from its annex less than a mile from the diplomatic mission.

The attack by what is now suspected to be a group of al-Qaida-linked militants killed U.S. Ambassador Chris Stevens and three other Americans.

The timeline was offered just days before the presidential election in an effort to refute news reports that said the CIA told its personnel to "stand down" rather than go to the consulate to help repel the attackers.

The officials told reporters that when the CIA annex received a call saying the consulate was under attack, about half a dozen members of a CIA security team tried to get heavy weapons and other assistance from the Libyans. But when none was available, they went ahead with the rescue attempt. The officials said that at no point was the team told to wait.

The officials spoke on condition of anonymity.

The Obama administration's response to the attack has been challenged by Republicans questioning whether enough military and other support was requested and received. It has become an issue in the election, with President Barack Obama's Republican challenger, Mitt Romney, and GOP lawmakers accusing the White House of misleading Americans about the nature of the attack.

Yesterday, intelligence officials said they had early information that the attackers had ties to al-Qaida-linked groups, but did not make it public immediately because it was based on classified intelligence.

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