As Libyan opposition fighters continue to surround cities loyal to fugitive ruler Muammar Gaddafi, reports indicate that his spy chief has been arrested in the Libyan capital, Tripoli.
The National Transitional Council's forces detained Bou zaid Dorda, the head of Gaddafi's external security organization, during a search operation on Sunday, Press TV quoted Reuters as reporting.
Dorda is one of several former regime officials rounded up since anti-Gaddafi forces entered Tripoli on August 21. Dorda took on his job in May after his predecessor Moussa Koussa defected and fled to Britain.
Gaddafi's whereabouts have been unknown since Tripoli fell into the hands of revolutionary forces and his 42-year dictatorship collapsed nearly three weeks ago.
The developments come as Libyan revolutionary forces have captured the outskirts of Bani Walid, preparing to move into the center of one of Gaddafi's last strongholds.
Armored vehicles mounted with anti-aircraft guns have also massed in the desert outside Sirte -- the hometown of the fugitive Libyan ruler.
Bani Walid is one of the four towns still controlled by Gaddafi supporters. The other towns are Jufrah, Sabha and Sirte.
Libya has been the scene of intense fighting between government troops and opposition fighters since a revolution, seeking to topple Gaddafi, began in mid-February.