The teenagers bypassed Israeli army and police checkpoints before entering the area, which is under full Palestinians security control.
The Israeli army fired stun grenades and detained several of the activists for questioning, the Israeli news site Ynet reported. The army and police are still searching for additional teens, Ynet said.
On Sunday, an Israeli settler was shot dead and four others were injured after a group of Jewish worshippers snuck into Nablus without coordinating with Palestinian or Israeli security.
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