The Associated Press has obtained video from Iranian television taken during and just after two suicide bombers attacked a mosque in the southeastern Iranian city of Zahedan on Friday, killing at least 27 people. Please be warned, it contains some very graphic images:

As my colleagues William Yong and Alan Cowell reported, “The Sunni Muslim militant group Jundallah claimed responsibility for the attack in a statement on its Web site, saying that two of its ‘faithful and brave sons’ had detonated suicide bombs amid a group of Revolutionary Guards.” The group’s statement identified the two bombers as relatives of the former leader of Jundallah, Abdolmalek Rigi, who was executed by Iran in June.

Jundallah has taken responsibility for a string of bombings in Iran, including one last October that killed 15 members of Iran’s Islamic Revolutionary Guards Corps and 25 civilians. As Scott Lucas noted on the blog Enduring America, the broadcaster Al Arabiya reported receiving an e-mail message calling the attack revenge for the execution of Mr. Rigi.

The group’s online statement also said:

This operation is in response to the continuous crimes committed by the Iranian regime in Baluchistan. These two men sacrificed their souls to humiliate the regime and have proved that our misery will only end with Jihad and by scandalizing the criminals.

The group says it is fighting on behalf of Sunni Muslims from the Baluchi ethnic group, which is found on both sides of the border between Iran and Pakistan. In February, after the capture of Mr. Rigi, state-run television in Iran showed what it said was a televised confession from him. In that statement, Mr. Rigi said that he was supported by the United States.

In 2008, Seymour Hersh reported in The New Yorker that a former C.I.A. official said that the Bush administration had provided support to Jundallah as part of a scheme to undermine Iran’s government through covert military action.

As The Lede explained in a post on that televised confession, Mr. Rigi claimed in his statement in February that the Obama administration had continued to support his group and even contacted him the same week that the American president released a message of good will to Iranians celebrating the Persian new year, Nowruz.

Since Mr. Rigi’s televised statement came soon after similar confessions from detained opposition protesters, observers of Iran noted that it was possible that he had been forced to implicate the Obama administration.