Beirut port blast investigator Judge Tarek Bitar, who resumed his probe Monday in a surprise move after a 13-month suspension, has said that he did what his “conscience dictated” on him after “having reached a dead end.”

A U.S. State Department spokesperson said in a tweet Tuesday that "we support and urge Lebanese authorities to complete a swift and transparent investigation into the horrific explosion at the Port of Beirut".

The lead investigator into the blast, Judge Tarek Bitar, had decided Monday, to widespread surprise, to resume his probe into the disaster, despite the strong political pressure against him.

MP Ghazi Zoaiter angrily stormed out Tuesday of a session for the Administration and Justice Parliamentary Committee during the discussion of a law on the independence of the judiciary.

Hezbollah Coordination and Liaison Officer Wafiq Safa has said after meeting Free Patriotic Movement chief Jebran Bassil that "those dismayed by the (Hezbollah-FPM) understanding will not be happy tonight."

A Hezbollah delegation comprising Safa and Hezbollah secretary-general’s aide Hussein Khalil had met Monday with Bassil in Sin el-Fil's Mirna Chalouhi area.

Caretaker Prime Minister Najib Mikati on Monday noted that the caretaker cabinet “will certainly convene to tackle urgent issues.”

The public prosecution will deal with Judge Tarek Bitar’s decision to resume investigations into the Beirut port blast as being “inexistent,” and accordingly it will not implement release or prosecution orders, MTV reported.

Caretaker Justice Minister Henri Khoury meanwhile issued a statement noting that he learned of the decision from the media.

The lead investigator into the catastrophic Beirut port explosion, Judge Tarek Bitar, resumed his probe on Monday, a judicial source and TV networks said, after a 13-month suspension due to political pressure.

Unknown assailants hurled a stun grenade at LBCI's building in Adma on Sunday evening, causing material damage, the TV network said.

Lebanese Forces leader Samir Geagea on Sunday announced that “all political options are on the table to liberate the country and the people from the hegemony of Hezbollah and its allies.”

State Prosecutor Ghassan Oueidat has described as “positive” the first round of investigations that was carried out in Beirut by three European judicial delegations probing the wealth of Central Bank Governor Riad Salameh.