ISLAMABAD - At least nine people were killed and four others injured on Monday afternoon in a blast that hit a house in Pakistan's northwestern tribal region of Khyber Agency, local media and officials said.

Local civil administrator of the area said that the blast took place in a house of a local weapon dealer in Akakhel area of Tirah Valley in Khyber Agency, Pakistan's restive tribal region bordering Afghanistan.

The huge blast that was heard miles away from the site destroyed the house completely, killing at least nine people including three children.

Local residents and security forces rushed to the site and shifted the bodies and injured to the hospital.

According to local media reports, some people also got seriously injured but there was no reports about their figures.

Nature of the blast was not known yet, but local authorities feared that the blast took place in the stock of multiple weapons that the dealers had stored in his house.

Security forces cordoned off the building and launched a searched operation in the area.

In another incident on Monday morning, at least one student was killed and two others sustained injuries when a suicide bomber targeted a government school in the country's northwestern district of Hangu.