A Harrisburg man, who allegedly called for violence against 100 members of the U.S. military he identified on the Internet, was arrested today on charges of attempting to provide support to the Islamic State.

Jalil Ibn Ameer Aziz, 19, a U.S. citizen, allegedly used social media to propagate "hateful rhetoric" and aid budding terrorists in their pursuit to travel overseas, according to Asst. U.S. Attorney General for National Security, John P. Carlin.

Investigators seized "a tactical style backpack" in Aziz's closet which contained five high capacity M4-style weapons, magazines, ammunition, a knife and several survival items, Carlin said.

According to court papers, Aziz - who identified himself as "Colonel Shami" --  used at least 57 different Twitter accounts to advocate violence against the United States and to distribute ISIS propaganda. In one case, Aziz allegedly acted as a go-between, passing maps and telephone numbers, between a person in Turkey and several well-known members of ISIS.

In an affadavit filed today, investigators said Aziz, using the Twitter account @AnsaraUmmah8 in January, allegedly tweeted "#KillAllKufar KillAllKufar KillAllKufar KillAllKufar KillAllKufar" Kufar means "infidels" or "non-believers."

Later the same month, Aziz, using Twitter account @Colonel_Shami allegedlytweeted "#IS 'Know O Obama, that we are coming to America and know that we will sever your head in the White House." The post included a picture of a beheading.

In April, using Twitter account @AnsaraUmmah2Bl, "Peform your Islamic duty. Support the Jihad with your wealth. Surah Baqarah (@:195) RT and Share DM for more info."