New Delhi, Jan. 27 -- 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.

The arrival of the USS Abraham Lincoln aircraft carrier and guided missile destroyers accompanying it provide the U.S. the ability to strike Iran, particularly as Gulf Arab states have signaled they want to stay out of any attack despite hosting American military personnel.

Two Iranian-backed militias in the Mideast have signaled their willingness to launch new attacks, likely trying to back Iran after U.S. President Donald Trump threatened military action over the kil...