The identities of the dead in the North Waziristan region were not known, the officials said.
The four were riding in a car close to Miran Shah town, the main base of the Haqqani network, when two missiles struck, said the officials, who did not give their names because they were not allowed to brief reporters.
US intelligence believes the Haqqanis are the top threat to security in Afghanistan and that they enjoy the support of the Pakistani Army.
It wants the army to sever its ties and attack the group, something that the government refuses to do. The issue is a main cause of tensions between the two countries.
On Thursday, a missile attack close to Miran Shah killed Janbaz Zadran, who US officials said was a top commander in the network who helped orchestrate attacks in Kabul and southeastern Afghanistan.
They said he was the most senior Haqqani leader in Pakistan to be killed.source: boston.com
