A Harrisburg man accused of setting up 57 Twitter accounts to promote terror was indicted by a federal grand jury Tuesday on charges of aiding the Islamic State group.

Jalil Ibn Ameer Aziz, 19, was arrested during an FBI raid on his Pennsylvania home on Dec. 17. He’s scheduled to appear in federal court on Wednesday.

Aziz’s pro-ISIS efforts began in July 2014, according to the indictment. Aziz, a U.S. citizen, allegedly spread propaganda for the Islamic terror group through Twitter and helped recruits who were trying to reach ISIS territory in Iraq and Syria.

He also made threats against non-Muslims on the Internet, said he would behead President Obama in the White House and talked about buying women taken captive by ISIS, authorities said.

Law enforcement officials say they found a tactical backpack, bullets, gun clips, a head wrap to cover his face and a “modified kitchen knife” in Aziz’s closet.

He has used 57 different Twitter accounts -- all traced to the home he shares with his parents -- to advocate violence, encourage people to fund jihadist groups and express a desire to travel to territory controlled by the Islamic State group, prosecutors said. Aziz would create a new account each time Twitter suspended him for violating its terms of service, according to court documents.

The Associated Press contributed to this report.