government faces disturbances from some of the revolutionary brigades over issues including "perceived inequities in the treatment of war wounded" and the suspension of payments to former revolutionary fighters while procedures are put in place to regulate the disbursement of funds.

An attempt by Libyan militias to storm the prime minister's office Tuesday "indicates the seriousness of this discontent," he said. But the failed attack also displayed the government's determination to confront those taking to violence to pursue their demands, he said.

Martin urged stepped-up efforts to demobilize and integrate the revolutionary fighters and control their weapons.

He also urged the executive and legislative branches of the interim government, which have been at odds, to work together to ensure "tangible progress" on security and decentralizing government services before the election.

Martin saidhe believes the Libyan government is committed to ensuring access to justice for its citizens but "serious obstacles are hampering this process."

The transfer of prisons to the Ministry of Justice is progressing very slowly, with just 31 facilities and 3,000 detainees now under its control, Martin said.

"An additional number of detainees, perhaps around 4,000, are still in the custody of brigades, either at formal or secret detention facilities," he said.

Martin said "cases of mistreatment and torture of detainees continue," citing the deaths of three people at a detention center in Misrata on April 13.

"We have credible information that they were a direct result of torture, as well as information that at least seven other persons were tortured at the same facility," he said

On the economic front, he said