SAN'A, Yemen — A leading al-Qaida militant in Yemen who surrendered to Saudi Arabia last month provided the tip that led to the thwarting of the mail bomb plot, Yemeni security officials said today.

The officials said Jabir al-Fayfi, a Saudi militant who had joined al-Qaida in Yemen, told Saudi officials about the plan. The officials spoke on condition of anonymity because they were not authorized to talk.

U.S. officials have said an alert from Saudi Arabia led to the interception on Friday of two explosive devices, hidden in packages addressed to Chicago-area synagogues, on planes transiting in Britain and Dubai. Al-Qaida in the Arabian Peninsula, the terror group's affiliate in Yemen, is suspected in the attempted bombing.

The Saudi newspaper Al-Watan today cited Saudi security officials saying that the kingdom gave U.S. investigators the tracking numbers of the packages.

In October, Saudi Arabia announced that al-Fayfi had turned himself in.

Al-Fayfi, who is in mid-30s, had been captured by U.S. forces in Afghanistan following the 2001 toppling of the Taliban there. He was held at the U.S. prison at Guantanamo Bay, Cuba, until early 2007, when he was released to Saudi Arabia.