At least nine people were killed and four others injured when a blast hit a house in Pakistan's northwest tribal area of Khyber Agency on Monday afternoon, local media Dunya reported.

The killed include three children, said the report quoting local administration, adding that several women were also injured in the blast.

The blast took place in a drawing room of a local resident's house in Tirah Valley, a small town bordering on Afghanistan, said local media.

The nature of the blast and other details are not known at this point.