Explosives, knife uncovered at Tamun
Explosives, knife uncovered at TamunIDF Spokesman's Unit

Two terrorists with explosive device and firebombs were caught, Thursday evening at the Tapuach checkpoint in Samaria.
Traffic at the junction was blocked in both directions.

The official IDF Blog has published a list of five bombing attempts foiled by the IDF in just the past four weeks. Under the heading "The 2012 Bombing Attacks You Never Heard Of," it lists the following:

April 11: IDF forces stopped a would-be bomber over Passover at a checkpoint east of Shechem, in northern Samaria. The terrorist was carrying improvised explosive devices, three knives and 50 bullets.

April 21: 2 Palestinian Authority teens carrying bombs and guns were nabbed by Israeli forces. They were apprehended near Tapuach Junction with 5 pipe bombs, a gun, and ammo.

April 24: IDF forces uncovered 4 improvised bombs on two Arabs at a crossing north of Jericho. The bombs were found in the men’s bags and detonated safely.

April 28: IDF forces nabbed 2 terrorists with 4 pipe bombs as they were trying to smuggle explosives through a checkpoint in northern Samaria.

May 7: Israeli forces arrested 17-year-old Palestinian for carrying 3 pipe bombs. The teen was detained near Tapuach junction.

Israel comes under intense international scrutiny over its military presence in Judea and Samaria. The reason for this presence – the Arab terrorist infrastructure – receives much less coverage.