A roadside bomb has killed at least seven people near a Shia Muslim procession in north-western Pakistan.
The attack took place in the city of Dera Ismail Khan, a stronghold of Sunni Muslim militant groups.
More attacks are feared in the coming days as Shia Muslims mark the climax of the holy month of Muharram.
Pakistan has suspended mobile phone coverage in several major cities after a series of bomb attacks on Shias, detonated by mobile phones.
One report said that four children were among those killed by the device on Saturday, set off by a television remote control device because of the phone service restrictions.
Police said that about 100 Shia were passing through the city to join a main procession when the bomb went off.
A total of 17 people were wounded in the attack, Reuters reports.
“The explosion was powerful and was heard many kilometres away,” police officer Siddiq Khan told AFP news agency.
President Asif Ali Zardari condemned the bombing.
“Such nefarious acts cannot deter the people and the government in their fight against the scourge of militancy,” he said in a statement.
Hardline Sunnis have threatened more attacks as the Shia mourning month comes to a climax.
More than a dozen people have already been killed this week observing Muharram.
Saturday’s attack occurred near the South Waziristan tribal area, a stronghold of al-Qaeda-linked Sunni militant groups who regard Shias as non-Muslims.
On Sunday, Shias celebrate Ashoura, which commemorates the 7th Century death of Imam Hussein, the grandson of Prophet Muhammad.
The schism between Sunni and Shia about his rightful heir dates from this time.