How'd that get in there?

This follows the well-known pattern of only Muslims being allowed to get the weapons that other Muslims have hidden in mosques (money line from the Lebanese imam in that video: "even if they enter mosques, destroy these mosques over their heads because they deserve it"). If Israel went into a mosque to get guns being used to kill Israelis, cries of righteous indignation would echo for months through the halls of the UN and the streets of the Muslim world. Which is exactly why the Palestinians use mosques and hospitals as military installations.

References:
* Palestinians start Ramadan together [JPost]
* Palestinians Commit Several War Crimes in Just a Few Hours. Instead of Reporting That, Reuters Publishes Gripping Tale of Glorious Palestinian Martyrdom (and We're Not Even Exaggerating About That...) [MR]
* Boston Globe Notices UN Is Not Entirely Fair To Israel (Plus: Lebanese Muslims Pissed That Even Israel Is More Humane Than Syria) [Video] [MR]

Previously:
* People Who Live In Glass Context Houses Shouldn't Throw Stones
* Hey, Did You Hear that Hezbollah Is Hiding Weapons In Mosques? It's OK, the UN Hasn't Either.
* Palestinians Commit Several War Crimes in Just a Few Hours. Instead of Reporting That, Reuters Publishes Gripping Tale of Glorious Palestinian Martyrdom (and We're Not Even Exaggerating About That...)