In addition to seizing cryptocurrency meant to support Hamas’ military wing, the department said that it had taken control of website domains and communication platforms used for fundraising and recruitment, and had obtained information about thousands of people who had contacted Hamas with a goal of giving money to the group.

“My message to Hamas is clear: your networks are not secure, your crypto is vulnerable, and we will not stop until your ability to wage war is defeated,” Jeanine Pirro, the U.S. attorney for the District of Columbia,…