Syria airstrikes
The guided-missile cruiser USS Philippine Sea (CG 58) launches a Tomahawk cruise missile, as seen from the aircraft carrier USS George H.W. Bush (CVN 77), in the Arabian Gulf in this handout photograph taken and provided on September 23, 2014. Reuters

The Pentagon on Wednesday said it was still investigating whether U.S. strikes in Syriaon Tuesday killed a leader of the al Qaeda-linked Khorasan group, adding that it could take time to determine.

"We just don't have a confirmation to make at this point," said Pentagon spokesman Colonel Steve Warren. "We don't have personnel on the ground to verify, so we're continuing to assess."

Reuters quoted a U.S. official earlier on Wednesday saying the United States believed one of those killed in the strike against the group was Mohsin al-Fadhli, who the U.S. government has identified as a al Qaeda financier close to al Qaeda founder Osama bin Laden.