WASHINGTON—Enrique Tarrio, a leader of the Proud Boys, has been indicted on conspiracy and other charges related to the Jan. 6 attack on the U.S. Capitol, the Justice Department said, alleging he developed plans with other members of the extremist group to storm the building that day.

Mr. Tarrio, 38 years old, was arrested in Miami and was expected to appear in federal court in Florida later Tuesday.

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WASHINGTON— Enrique Tarrio, a leader of the Proud Boys, has been indicted on conspiracy and other charges related to the Jan. 6 attack on the U.S. Capitol, the Justice Department said, alleging he developed plans with other members of the extremist group to storm the building that day.

Mr. Tarrio, 38 years old, was arrested in Miami and was expected to appear in federal court in Florida later Tuesday.

Mr. Tarrio was previously arrested two days before the attack on Jan. 6, 2021, charged in connection with unrest that followed pro-Trump protests in the nation’s capital in December 2020 and ordered to stay outside Washington. He later pleaded guilty to charges stemming from his burning of a Black Lives Matter banner belonging to a historic Black church and possession of two high-capacity firearm magazines.

From the Archives

The Proud Boys, a far-right group, have tried to downplay their role in the Capitol riot. A WSJ investigation shows that at many of the day’s key moments, Proud Boys were at the forefront. Photo illustration: Laura Kammermann (Video from 1/26/21) The Wall Street Journal Interactive Edition

Even though he wasn’t present at the Capitol during the riot, federal prosecutors said Mr. Tarrio led the planning for Jan. 6 and continued to direct and encourage the Proud Boys before and during the attack. Mr. Tarrio also claimed credit for what had happened on social media and in an encrypted chat room during and after the attack, prosecutors said.

He is charged in a superseding indictment obtained in another case against other alleged members of the Proud Boys, and faces one count of conspiracy to obstruct an official proceeding and obstruction of an official proceeding, as well as two counts each of assaulting, resisting, or impeding certain officers and destruction of government property, the Justice Department said.

More than three dozen members or affiliates of the Oath Keepers, a right-wing militia group, and the Proud Boys have been arrested in connection with Jan. 6.

Eleven people including Stewart Rhodes, the leader and founder of the Oath Keepers, were indicted in January on charges of seditious conspiracy, marking an escalation of the Justice Department’s investigation.

One of them, a military veteran from Alabama, was the first to plead guilty to that charge last week.

The charges came as jurors began deliberating Tuesday morning in the first trial to stem from the attack. Texan Guy Reffitt

faces charges of obstructing an official proceeding, civil disorder, a gun crime and another obstruction count for allegedly threatening his children not to report him.

Write to Sadie Gurman at sadie.gurman@wsj.com and Aruna Viswanatha at Aruna.Viswanatha@wsj.com