Asia news sources are reporting that four people have been arrested in connection with last week's decapitation of Nicholas Berg. No identities have been released, but reportedly, Abu Mussab al-Zarqawi is not among them.

Four people were arrested over the beheading of US businessman Nicholas Berg, an Iraqi source said, as top officials at the funeral of Iraq's slain Governing Council president vowed not to cave in to terrorists. The source said four people were held over Berg's murder in a possible breakthrough in the US-led battle against extremists that have been trying to undermine efforts to transfer sovereignty to Iraqis on June 30.

The U.S. says it has not received any arrest information:

But Brigadier General Mark Kimmitt, deputy director of operations, said: "We have no information from the coalition that any arrests were made today."