A Pakistani military official says fighter jets killed 25 Islamist fighters Sunday in the northwestern Swat Valley.

In the Bajaur district, near the Afghan border, authorities say 10 more militants were killed in combined land and air assaults.

The operations took place during a visit to Islamabad by U.S. Assistant Secretary of State Richard Boucher. The top U.S.diplomat for the region was in Islamabad for talks with government officials.

The U.S. Embassy gave no details about Boucher's trip, but said it had been planned for a while.

Boucher met Pakistan's Interior Ministry chief Rehman Malik Saturday and is also expected to meet Prime Minister Yousaf Raza Gilani.

The United States has been pushing Pakistan to take stronger action against Taliban and al-Qaida militants hiding near the Afghan border.  Authorities suspect the militants use the bases to attack soldiers in neighboring Afghanistan.

In southwest Pakistan Sunday, police said a roadside bomb killed at least one person and wounded others. They said the bomb was intended for a Pakistani lawmaker.

The exact location of the attack is unclear.

Some information for this report was provided by AFP, AP and Reuters.