Lebanese media report the United Nations backed tribunal investigating the 2005 assassination of former Prime Minister Rafik Hariri has issued four arrest warrants and a sealed indictment to Lebanon's prosecutor general.

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

Mr. Hariri's son Saad Hariri, also a former prime minister, says the indictments mark a “historic moment.”

The development comes just two weeks after Lebanese Prime Minister Najib Mikati announced a long-delayed coalition government dominated by the Iranian-backed 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 Rafik Hariri in a 2005 Beirut truck bombing.