Siege of the Grand Mosque in Mecca

The Siege of the Grand Mosque in Mecca was a pivotal event in the evolution of terrorist actions.

Smuggling in their weapons on biers(objects used to transport the dead into the mosque for ritual washing), Jayman al-Oteibi and Mohammed Abdullah al-Qahtan led a group of 400-500 insurgents in an attack on the Grand Mosque that lasted two weeks and claimed an estimated 4000 lives.