A federal grand jury on Thursday returned a 30-count indictment against Boston Marathan bombing suspect Dzhokhar  Tsarnaev, accusing him of gathering bomb-making instructions and materials on Islamic jihad and martyrdom from the Internet.

The indictment includes many of the same weapon-of-mass-destruction charges, punishable by the death penalty, that were brought against the 19-year-old Tsarnaev in April.

But prosecutors added charges covering the slaying of  an MIT police officer and the carjacking of a motorist during the getaway attempt that left Tsarnaev’s older brother, Tamerlan, dead.

Attorney General Eric Holder said the indictment was the result of cooperation between federal prosecutors and a wide range of federal, state and local law enforcement agencies.

“The department is firmly committed to achieving justice on behalf of all who were affected by these senseless acts of violence.  And today’s action proves our unyielding resolve to hold accountable  –  to the fullest extent of the law – anyone who would threaten the American people or attempt to terrorize our great cities,” Holder said.

The indictment charges that beginning no later than February 2013 and continuing until Tsarnaev was apprehended by authorities on April 19, Tsarnaev and his brother Tamerlan conspired to use “improvised explosive devices against people, property and places of public use.”

The indictment specially accused  Tsarnaev and his brother Tamerlan of detonating home-made bombs along the marathon route that resulted in three fatalities and more than 260 peopled injuried.

The indictment says the bombs were constructed from pressure cookers, explosive powder, shrapnel, adhesives and other items, and were designed to “shred skin, shatter bone and cause extreme pain and suffering, as well as death.”

Tamerlan Tsarnaev was killed in a shootout with police during the manhunt for the two brothers. The Tsarnaevs, born of Chechen origin in areas of the former Soviet Union, immigrated to the United States as children with their family.