The Pakistani army says its fourth-month-old offensive in a tribal region bordering Afghanistan has been a success and that at least 1,100 militants have been killed so far.

Army spokesman Maj. Gen. Asim Saleem Bajwa told reporters on Wednesday that the operations in North Waziristan, which were launched in June, are going according to plan.

He says its positive impact is being felt across Pakistan with a decrease in "terrorist attacks, extortion and kidnappings."

Bajwa says most areas in North Waziristan have been cleared and reconstruction is underway.

The tribal region was considered a sanctuary for local and foreign militant group until the military launched its offensive there in June, following a deadly militant attack on the country's busiest airport in Karachi.