Lebanon has filed charges against two Lebanese brothers named in a U.N. probe into the assassination of former Prime Minister Rafik Hariri.

Officials said they had recently arrested the two men, Ahmad and Mahmoud Abdel-Al, who are members of a pro-Syrian Islamic militant group, Al-Ahbash.

Meanwhile, U.S. officials warned of possible measures against Syria if it refuses to cooperate with the U.N. probe into Mr. Hariri's killing.

U.S. officials are co-sponsoring a draft resolution at the United Nations that would impose sanctions on suspects in the murder.

Syrian officials have rejected the U.N. probe, which implicates top Syrian and Lebanese officials.

Russia, which holds a veto on the Security Council, says it will oppose sanctions against Syria. 

The Arab League and Mr. Hariri's son, Saad, have also expressed opposition to possible U.N. sanctions.

Some information for this report provided by AP, AFP, Reuters.