The United States said Tuesday it does not differentiate between Hizbullah's armed and political wings as it again urged Europe to blacklist the group, a decision diplomats indicated could be imminent.

A formal request to brand the party as a terrorist group was filed by Britain and is to be discussed at closed-door talks June 4 of a committee overseeing the EU list of people and groups subject to its asset freezing regime, European diplomats said.

Iranians are working alongside Hizbullah fighters to back Syrian troops battling to retake the rebel stronghold of Qusayr amid fears of a civilian massacre, a U.S. official said Tuesday.

"It is the most visible effort we have seen by Hizbullah to engage directly in the fighting in Syria as a foreign force, and we understand there are also Iranians up there," a senior State Department official told reporters.

Clashes renewed in a fierce manner in Tripoli on Tuesday afternoon, leaving at least four people dead and several others wounded, as the Arab Democratic Party declared an open battle and warned that it “will not let Tripoli sleep.”

The National News Agency said Mohammed Rashid Soltani, 30, was killed and two other people were wounded, identifying them as Yehia Seif Obeid, 81, and Khaled Mohammed Mohammed, 33.

Al-Mustaqbal parliamentary bloc urged the three presidents on Tuesday to act quickly and draw an end to "Hizbullah's crimes in Syria," considering that the party is implementing the instructions of the Iranian Revolutionary Guard.

"We call on President Michel Suleiman, Caretaker Prime Minister Najib Miqati and Speaker Nabih Berri to act quickly to stop Hizubllah's involvement in killing Syrians in (the Syrian border town of) al-Qusayr,” the lawmakers said in a released statement after the bloc's weekly meeting at the Center House.

Free Patriotic Movement leader MP Michel Aoun announced on Tuesday his readiness to have parliament vote on the Orthodox Gathering and hybrid electoral draft laws.

He said after the Change and Reform bloc's weekly meeting: “I am prepared to accept the outcomes of the votes on both of the draft laws.”

A car passenger was wounded on Tuesday as army troops opened fire on the vehicle after its driver refused to stop at a military checkpoint in the northern town of al-Awwadeh in the Wadi Khaled region, state-run National News Agency reported.

The wounded man was rushed by a Lebanese Red Cross ambulance to the Our Lady of Peace Hospital in al-Qoubaiyat, while the army arrested a man from the al-Shiban family.

Two people were arrested for their involvement in various kidnappings for ransom that had taken place in Lebanon in recent months, announced the Internal Security Forces Intelligence Bureau in a statement on Tuesday.

It said that a Lebanese and Syrian national were arrested for the attempted kidnapping of the owner of a paper company in al-Metn.

President Michel Suleiman stressed on Tuesday the need for all Lebanese factions to adhere to the Baabda Declaration that calls for disassociating Lebanon from regional conflicts.

He called on “Lebanese powers against getting dragged into the ongoing fighting in Syria in line with the Declaration.”

The European Union stands poised to put the military wing of Hizbullah on its list of terrorist organizations after a formal request to blacklist the group was filed by a member state Monday, diplomats said.

The request from Britain formally launches a process to blacklist the group, a move that has long been requested by Israel and which will be discussed in early June, several EU diplomats told Agence France Presse.

Dozens of people, mostly combatants, have been killed in ongoing battles for the Syrian town of Qusayr, a watchdog said Tuesday, as Hizbullah sent new elite fighters to the rebel stronghold.

"At least 31 Hizbullah fighters have been killed since Sunday, as well as 68 rebel fighters, six of whom we were unable to identify," said the Syrian Observatory for Human Rights.