BEIRUT, Lebanon (CNN) -- Two Lebanese brothers were charged Wednesday in connection with the assassination of former Lebanese Prime Minister Rafik Hariri, presidential spokesman Rafic Shalala said.Presidential spokesman Rafic Shalala confirmed that Mahmud and Ahmed Abdel-Al, have been charged.The brothers, identified as Mahmud and Ahmed Abdel-Al, were already in custody. Ahmed was arrested more than a month ago on weapons possession charges, and Mahmud was arrested Saturday after the release of a U.N. report on the Hariri assassination.That report said Mahmud telephoned Lebanese President Emile Lahoud minutes before the February 14 blast that killed Hariri and 20 others.The U.N. report -- called the Mehlis report after its author, German prosecutor Detlev Mehlis -- concluded that there was "converging evidence" of involvement by Syrian and pro-Syrian Lebanese officials in the assassination.The U.N. probe concluded that the bomb used to kill Hariri was detonated above ground and used at least 1,000 kilograms (2,200 pounds) of military explosives.