Ambassador Chris Stevens feared he was on an al Qaeda hit list before his death in an attack on the U.S. consulate in Benghazi last Tuesday, according to a CNN source. The CNN source also said Stevens had mentioned al Qaeda's increased presence in the country.

The report comes after U.S. official Matthew Olsen on Monday told the Senate Homeland Security and Governmental Affairs Committee that the attack on Stevens was likely "opportunistic."

"What we don't have at this point is specific intelligence that there was a significant advanced planning or coordination for this attack," Olsen said.

To date, U.S. officials and the Libyan government have offered different -- though perhaps not contradictory -- accounts of whether or not the deadly U.S. consulate attack was planned.

On Thursday, U.S. Deputy Secretary of State William Burns arrived in Tripoli to meet with Libyan government officials.

Read the full report from Reuters below.

TRIPOLI, Sept 20 (Reuters) - U.S. Deputy Secretary of State William Burns arrived in Tripoli on Thursday, a week after a deadly attack on the U.S. consulate in the eastern Libyan city of Benghazi.

Burns flew into the Libyan capital where he was due to meet new Prime Minister Mustafa Abu Shagour and Mohammed Magarief, head of the national congress, Libyan government officials said.

He was also scheduled to attend a ceremony commemorating U.S. ambassador to Libya Christopher Stevens, who died in last week's consulate attack in Benghazi, they said.

Stevens and three other Americans died when gunmen attacked the U.S. consulate and a safe house. The attackers were part of a crowd that blamed the United States for a video posted online that mocks the Prophet Mohammad.

A top U.S. counter-terrorism official told Congress on Wednesday the assault on the consulate was a "terrorist attack" that may have had an al Qaeda connection. (Reporting by Tripoli bureau; Editing by Alistair Lyon)

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  • Chris Stevens, Christopher Prentice, Suleiman Fortias

    In this photo taken Monday, April 11, 2011, then U.S. envoy Chris Stevens, center, accompanied by British envoy Christopher Prentice, left, speaks to Council member for Misrata Dr. Suleiman Fortia, right, at the Tibesty Hotel where an African Union delegation was meeting with opposition leaders in Benghazi, Libya. (AP Photo/Ben Curtis)

  • Chris Stevens

    In this photo taken Monday, April 11, 2011, then U.S. envoy Chris Stevens attends meetings at the Tibesty Hotel where an African Union delegation was meeting with opposition leaders in Benghazi, Libya. (AP Photo/Ben Curtis)

  • Chris Stevens, Christopher Prentice, Suleiman Fortia

    In this photo taken Monday, April 11, 2011, then U.S. envoy Chris Stevens, center, accompanied by British envoy Christopher Prentice, left, speaks to Council member for Misrata Dr. Suleiman Fortia, right, at the Tibesty Hotel where an African Union delegation was meeting with opposition leaders in Benghazi, Libya. (AP Photo/Ben Curtis)

  • Chris Stevens

    In this photo taken Monday, April 11, 2011, then U.S. envoy Chris Stevens speaks to local media before attending meetings at the Tibesty Hotel where an African Union delegation was meeting with opposition leaders in Benghazi, Libya. (AP Photo/Ben Curtis)

  • Chris Stevens, Christopher Prentice

    In this Monday, April 11, 2011 file photo, U.S. envoy Chris Stevens, left, speaks with British envoy Christopher Prentice, right, in the lobby of the Tibesty Hotel where an African Union delegation was meeting with opposition leaders in Benghazi, Libya. (AP Photo/Ben Curtis, File)

  • US diplomatic envoy to rebel-held Libya Chris Stevens (front row 2nd-R), Britain's diplomatic representative Christopher Prentice (L), and deputy chairman of the TNC Abdul Hafiz Ghoqa (2nd-L) listen as Agence France-Presse reporter Marc Burleigh (R) speaks during a memorial service for slain photojournalists Tim Hetherington and Chris Hondros in Benghazi on April 21, 2011. (ODD ANDERSEN/AFP/Getty Images)

  • Bristish and US envoys to Libyan rebels Christopher Prentice (L) and Chris Stevens attend a press conference of Libyan rebel leader Mustafa Abdul Jalil (not pictured) after his meeting with African head of states, in the eastern rebel stronghold of Benghazi, on April 11, 2011. (MARWAN NAAMANI/AFP/Getty Images)