Lebanon's former prime minister Saad Hariri says the indictments issued Thursday by a U.N.-backed tribunal investigating the 2005 assassination of his father mark a “historic moment.”

The international tribunal based in The Hague issued four arrest warrants and a sealed indictment to Lebanon's prosecutor general.

Reports say at least two of the arrest warrants are for members of the Hezbollah militant group.

The reports come just two weeks after Lebanese Prime Minister Najib Mikati announced a long-delayed coalition government dominated by the Iranian-backed militant group Hezbollah and its allies.

Lebanon had functioned without an official government since mid-January, when Hezbollah and its allies forced the collapse of then-Prime Minister Saad Hariri's pro-Western government.

The Hezbollah-led group withdrew from the national unity Cabinet at that time due to disagreements about the tribunal's investigation of the assassination of Mr. Hariri's father, Rafik Hariri, in a 2005 Beirut truck bombing.