In two-day long military operation Friday, forces arrested at least twenty tribesmen involved in a series of rocket strikes in recent days in North Waziristan tribal agency, bordering Afghanistan, said sources. The armed forces also engaged four helicopter gunships in the 11-hour long search operation in Dutta Khel and nearby Hamozi and Mizar MadaKhel tribes of the agency, official sources told KUNA. Sources said that residential compounds were searched in tribes and heavy arms and ammunition were recovered from the mud-houses.Operations were launched after a series of rocket attacks on the security forces. An armyman was wounded in an attack, targeting military convoy on Thursday. About 1,000 army, paramilitary troops and personnel of the Quick Reaction Force last week conducted a major operation in North Waziristan agency. Forces busted biggest Al-Qaeda den, a Madrassah and adjacent compound of former Taliban minister Sirajuddin Haqqani, also known as Al-Qaeda rebel, in the agency and seized 15 truckloads of arms and ammunition. They also arrested 21 militants including 11 foreigners, believed to be of Uzbek, Tajik and Arab origins.