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HAMAS and Free Syrian Army

Published on 05 April 2013, by M. Tomazy.
According to the Times, Hamas has been helping the FSA in digging a tunnel beneath Damascus in preparation for an attack on the city, a skill that Hamas has honed since constructing previous tunnels to smuggle supplies from Egypt into the Gaza Strip.

A Palestinian source from Lebanon's Ain al-Hilweh Palestinian refugee camp reportedly said that Hamas' aide to the FSA is common knowledge, however Hamas officials have denied any affiliation with Syrian rebels.
Makes sense, what with Hamas being a Sunni extremist group. They will deny involvement so as to not jeopardise their arms shipments from Iran.

Got to hand it to the palestinians. They certainly aren't the loyal type. Syria & Assad helped them against Israel for decades, and as soon as Assad gets in trouble - Hamas runs out of Damascus and is now training the FSA.