VIDEO - IDF forces exposed an explosives laboratory in the West Bank city of Nablus Sunday afternoon, the second in two days. The raid was part of a large-scale military operation launched Sunday in Nablus, which continues to be a major hub of terror activity. The army defined the operation as "activity against terror infrastructure." The operation was unlimited in time and scope and would be ongoing until its objectives were achieved, an IDF spokesperson said. The laboratory discovered Sunday contained an intact LAW guided missile, five pipe bombs, a large explosive device, two bottles of TNT, magazines and four sacs of fertilizer to be used in bomb manufacture. Defense officials told Ynet that they were not surprised to find a working LAW missile in Nablus. “The IDF is aware that the Palestinians are in possession of such missiles in the West Bank area,” an official said. Full closure imposed on Nablus Israeli troops entered Nablus in the early morning hours aiming to arrest terror suspects and raid explosives laboratories. Forces imposed a closure on the West Bank city and took up a number of lookout points around the city, witnesses said. Palestinian hurls stones at IDF convoy (Photo: AFP) A Palestinian source told Ynet that for the first time in years, soldiers set up concrete barriers and sealed off entrances to Nablus from all directions. Witnesses said the operation was being carried out with aerial cover. The IDF also reportedly seized a school in the city center and brought dozens of male suspects to the schoolyard for interrogation. Palestinian sources reported that the forces besieged eight members of the al-Aqsa Martyrs' Brigades members, Fatah's military wing, and that at least 10 Palestinian were arrested in the city. IDF officials said that the forces siezed a number of buildings in which wanted suspects were hiding. The operation infuriated the Palestinian leadership, which accused Israel of violating agreements aimed at building confidence between the sides. A spokesperson for Palestinian President Mahmoud Abbas issued an official statement saying, “This is a violation of the agreements of the three-way summit. Israel is trying to sabotage efforts to mend confidences and to threaten the implementation of the Mecca deal. Israel must stop its aggression against the Palestinians.” The statement also called on the international community to interfere. Ali Waked contributed to the report