The outlawed Kurdistan Workers' Party (PKK), which for years waged a deadly insurgency against Turkish authorities, called on all Kurdish armed groups Tuesday to unite against radical Islamist militants who have seized swathes of northern Iraq.

"Our efforts alone are not enough. There must be a joint (effort)" against the Islamic State (IS), the PKK's military leader Murat Karayilan said in remarks carried by the Radikal online newspaper.

Free Patriotic Movement leader MP Michel Aoun declared on Tuesday that he had long warned against the spread of the repercussions of the Syrian crisis to Lebanon, warning against holding negotiations with terrorists fighting the army in the northeastern town of Arsal.

He said after the Change and Reform bloc's weekly meeting: “I warn against carrying out negotiations with terrorists as we should negotiate with Damascus, not the Islamic State of Iraq and the Levant.”

The Russian Foreign Ministry stated on Tuesday that Syria, Iraq and Lebanon are facing a “common danger” manifested in “international terrorism that does not acknowledge borders between countries and seeks to seize more lands.”

"It is necessary to denounce double standards and to abstain from taking steps that do not lead to containing the situation but on the contrary, could encourage terrorism and extremists' threats in the turbulent Middle East,” Russia's Ministry of Foreign Affairs said in a released statement.

Jailed Indonesian militant cleric Abu Bakar Bashir has pledged allegiance to jihadists who have overrun swathes of Iraq and claimed leadership of the world's Muslims, a radical group said Tuesday.

Kuwait has stepped up controls on Islamic charities, including donations for war-ravaged Syria, as part of measures to curb funding for extremists, newspapers reported Tuesday.

Australia will toughen laws to target home-grown terrorists and those who fight overseas over fears violent jihadist citizens in Syria and Iraq will return home, officials said Tuesday.

Al-Mustaqbal Movement leader Saad Hariri reiterated staunch support to the Lebanese army in its battle against terrorism, rejecting attempts to cover up for Hizbullah's engagement in the fight raging in neighboring country Syria.

“Our support to the army against gunmen who infiltrated (the northeastern border town of) Arsal is steadfast that will not undergo political bids,” Hariri said in a statement issued by his press office on Tuesday.

Clashes between the Lebanese army and gunmen left a child dead and several injured on Tuesday as roads in and around the northern city of Tripoli remained blocked, the state-run National News Agency reported.

The fighting renewed on Tuesday morning after a cautious calm following a night of gunbattles between the army and masked men.

Abou al-Hassan al-Filastini, the emir of the Islamic State of Iraq and the Levant (ISIL), who initiated the attack on the northeastern town of Arsal on Saturday, was killed.

According to As Safir newspaper published on Tuesday, al-Filastini succumbed to wounds he sustained during battles with the Syrian army in the Qalamoun, which borders the Bekaa valley town of Arsal.

The U.N. Security Council on Monday condemned attacks by extremist groups in Lebanon, backing the government's military response but warning Beirut against being dragged deeper into the Syria conflict.

Scores of Lebanese soldiers have been killed and injured in three days of clashes with jihadists in the northeastern town of Arsal near the Syrian border, according to the Lebanese army.