BEIRUT - Lebanese Prime Minister Fouad Seniora vowed to catch the 'terrorists' behind Tuesday's deadly bomb attacks which he said were carried out by the same killers of late premier Rafik Hariri.

'We will not be scared or terrorised, and we will pursue the criminal terrorists,' Seniora vowed in a TV address to the nation.

Seniora was responding to the two bomb blasts which ripped through two buses in the Christian area of Ainalek, north-east of Beirut early Tuesday, killing three people and wounding 30. The three killed included two Lebanese and one Egyptian.

Police sources said initial reports showed that explosive charges were placed inside the buses.

No one has claimed responsibility for the attacks, which drew condemnation from countries around the world.

'We will not give up our determination to reach justice. We are determined to uncover the killers,' he said about the attack, coming on the eve of the second anniversary of the terror bomb assassination of Hariri.

That attack was widely blamed on Syria and its Lebanese allies. A number of anti-Syrian figures in Lebanon have also been targeted by explosions in the last two years. Damascus has vehmently denied involvement in any of the attacks.

'This is another terrorist attempt to exert control over Lebanon with blood,' charged Telecommunications Minister Marwan Hamadeh, a member of the anti-Syrian parliamentary majority.

'We call for unity to put a stop to those who are after destruction at a time when the Lebanese ... are trying to resolve their differences,' Hezbollah MP Hussein Hajj Hassan said.

Government supporters are planning ceremonies Wednesday to mark the second anniversary of Hariri's assassination.

Speaker of parliament Saad Hariri, son of the late premier, described Tuesday's bombings as a 'cowardly terrorist attack' which were aimed at disrupting ceremonies for his slain father.

He said the recent attacks showed the need for the formation of an international tribunal to try those suspected in his father's killing and other attacks.

Lebanon's opposition which is headed by Hezbollah and anti-Syrian groups are headed for a showdown Wednesday as government supporters plan to mark Hariri's death in the same Beirut square where the opposition has been staging a sit-in for more than two months.

'What happened today will not scare our followers and we will continue in pursuing the establishment of an international tribunal to uncover the killers,' anti-Syrian MP Akram Chuyaheb said.

The political crisis in the country escalated into violence last month, with clashes last month between pro- and anti-government demonstrators killing six persons and wounding more than 200 others.

The opposition have been calling on the Seniora government to resign and to form a national unity.

Seniora has rejected the demand and vowed Tuesday that the government is staying. -DPA