MIRAMSHAH/GHALANAI, Nov 5: Four persons were killed and two others injured when assailants attacked two vehicles in different areas of North Waziristan Agency.

The political administration imposed curfew in major towns of the tribal region and launched search operation after the incidents.

Sources said that three members of Wazir tribe were killed when their vehicle was attacked by unidentified assailants near Epi area of Mir Ali tehsil. They said that members of Wazir tribe were going to their homes from Mir Ali Bazaar. All the three tribesmen were killed on the spot, they added.

Sources said that the assailants managed to escape. The authorities imposed curfew in Mir Ali and launched a search operation.

In the second incident, a driver of Frontier Works Organisation was killed and two of his colleagues were injured when their vehicle was attacked by assailants on Miramshah-Mir Ali Road. The deceased was identified as Akram Khan.

The political administration ordered imposition of curfew on Bannu-Miramshah Road. All educational institutions, government offices and shops at Miramshah Bazaar were closed after the incident. In Mohmand Agency, two security personnel sustained injuries when a suicide bomber blew himself up in front of the office of assistant political agent in Yakaghund on Monday.

Officials said that the bomber wanted to target APA office but he failed to reach his target owing to strict security arrangements.

The bomber blew himself up when he sensed that Khasadar personnel could arrest him, they added.

They said that subedar Javed and sepoy Rehman were injured in the blast. The injured were shifted to Peshawar in critical condition.

APA Fahad Wazir told journalists that the bomber was about 25-year-old and seemed a non-local. He said that about five kilograms of explosives were used in the blast.

Officials said that they received information that a suicide bomber had entered the area and APA office was his apparent target.

Strict security measures were taken and the attempt to target APA office was foiled, they added.

Security forces cordoned off bazaars in Yakaghund, Main Mandi and Ghalanai and launched a search operation. However, no arrest was made. The main Peshawar-Bajaur Road remained closed to traffic for more than four hours. It is pertinent to mention here that 110 persons were killed and over 120 injured in a suicide attack on the same office on July 9, 2010.