Lastly , an operation in April 2009 in Qalqilya in which PA troops uncovered a weapons lab inside a mosque .
A workshop containing 80 kg of explosives was a major counterterrorism activity that led to a number of clashes between PA troops and Hamas members in the area .
Lastly , an operation in April 2009 in Qalqilya in which PA troops uncovered a weapons lab inside a mosque and a workshop containing 80 kg of explosives was a major counterterrorism activity that led to a number of clashes between PA troops and Hamas members in the area .