Pakistani intelligence officials say a suspected U.S. drone strike has killed at least four militants in the country's North Waziristan tribal region.

Thursday's strike targeted suspected members of the Haqqani network — a militant group affiliated with the Taliban and al-Qaida fighting coalition forces in neighboring Afghanistan.

Officials say a logistics coordinator for the group, Jalil Haqqani, was among those killed when the unmanned aircraft fired two missiles at a compound near the region's main town Miran Shah.

The attack occurred hours before U.S. special representative Marc Grossman arrived in the capital, Islamabad, for talks with the country's prime minister and army chief on a series of regional and international issues.

Grossman is also likely to discuss U.S. concerns about the Haqqani network and allegations that elements of the Pakistani government is supporting it.

In other violence, gunmen opened fire on a convoy of at least five NATO oil tankers Thursday in southern Singh province.