At least 6,126 people killed in Iran's crackdown on nationwide protests, activists say

People walk in front a billboard with graphic showing a U.S aircraft carrier with damaged fighter jets on its deck, and sign reading in Farsi and English: "If you sow the wind, you

Iran's bloody crackdown on nationwide protests killed at least 6,126 people while many others still are feared dead, activists said Tuesday, as a U.S. aircraft carrier group arrived in the Mideast to lead any American military response to the crisis.

(Image credit: Vahid Salemi)