Islamic State sympathizers turned to Twitter in the aftermath of Sunday’s powerful San Francisco Bay Area earthquake to hijack related hashtags and post anti-American propaganda.

Popular hashtags such as “#sfearthquake” and #napaearthquake” were flooded with images of dead U.S. soldiers and pictures depicting the beheading of photojournalist James Foley.

TheBlaze has chosen not to publish the majority of tweets which contained graphic violence.

Sympathizers used the platform to accuse the U.S. of “torture” and alleged Americans are guilty of war crimes.

“As you kill us in Iraq, bomb us in Yemen and torture us in Afghanistan,” one tweet said, “We will kill you wherever we find you.”

Many of the tweets threatened that Islamic State militants would execute another American journalist, Steven Sotloff, unless President Barack Obama ordered a U.S. retreat from Iraq.

On Sunday, California’s Bay Area was rocked by a powerful 6.1 magnitude earthquake.

Follow Oliver Darcy (@oliverdarcy) on Twitter