Israeli security forces have arrested the Palestinian head of a Turkish-government-linked humanitarian aid organization in Gaza on suspicion of working for Hamas, the Shin Bet (Israel Security Agency) announced on Tuesday.The Shin Bet and police arrested Gaza resident Muhammad Murtaja, 39, in February while he was attempting to depart from Israel on a trip related to his position as the Gaza coordinator of the Turkish Cooperation and Development Agency (TIKA).Investigations revealed that Murtaja was recruited by Hamas in late 2008, and his activity with the Palestinian terror group including funneling funds earmarked for humanitarian project to Hamas.According to the Shin Bet, he was also involved in Hamas militant training and exercises, manufacturing weapons and explosive devices and digging terror tunnels. Murtaja was said to have stored weapons, such as hand grenades and guns, in his home on behalf of Hamas.