Two officials of the Frontier Constabulary (FC) were martyred and two others were injured in a blast in the Laka Tika area of Lower Kurram Agency on Monday, according to security sources.
The blast that used explosive material targeted post number two of the FC and was claimed by the Tehreek-i-Taliban Pakistan, sources added.
Last month, at least 74 people were killed and more than 200 were injured after two subsequent explosions hit a densely populated area of Kurram Agency's Parachinar city.
Parachinar, with a population of more than 50,000, has been under strict security arrangements for quite some time. Army and paramilitary personnel have set up checkpoints on all routes leading to the town and visitors and vehicles go through extensive search and identification process.
On March 31 this year, the city had suffered a similar tragedy when 23 people were killed in a car bomb blast near an Imambargah at midday. More than 70 others were wounded in the attack. Another person had died later after security forces opened fire on a crowd trying to hold a demonstration in front of the political agent’s office in protest against increasing terrorist attacks.
In January this year, 25 people were killed and 87 others suffered injuries when a bomb went off during peak business hours at a crowded vegetable market in the city. In what appeared to be a sign of growing cooperation among extremists, two banned groups had come forward to claim the deadly assault, with one describing the incident as a suicide attack.
The army had launched Operation Raddul Fasaad in February following a spate of terror attacks in the country, which claimed more than a hundred lives and left hundreds others injured.
The operation seeks to eliminate the "residual/latent threat of terrorism", consolidating the gains made in other military operations, and further ensuring the security of Pakistan's borders.
Hundreds of suspected terrorists have reportedly either been killed or arrested in raids carried out by security personnel since the start of the operation.