The authorities detained 13 people in Mandalay and seized weapons including 21 M-22 rifles, one M-16 rifle, their ammunitions, a homemade gun, 16 homemade bombs, 133 hand grenades, 2,400 detonators, 19 TNT bullets, a mine detector and 18 strings to explode bombs and they confessed that the weapons are intended for People Defence Force (PDF) in Tamu, announced Tatmadaw True News Information Team on June 3.