Even before the outbreak of the Al-Aqsa Intifada, various insurgent Palestinian groups built domestically-produced weapons for attacks against Israel. Most of the effort has been in the production of unguided artillery rockets, though Hamas has built its own versions of anti-tank missiles and rocket-propelled grenades (RPGs). Though usually smuggled across the Egyptian border into the Gaza Strip and to a lesser extent Jordanian border into the West Bank, various small arms are believed to be produced in the Palestinian territories.