Two South Florida men of Pakistani descent have been charged with plotting to provide material support to terrorists and to use a weapon of mass destruction within the U.S., federal prosecutors said Friday.

The men were identified as brothers Sheheryar Alam Qazi, 30, and 20-year-old Raees Alam Qazi. Both are naturalized U.S. citizens originally from Pakistan and both were arrested in the Fort Lauderdale area, prosecutors said.

Few details about the plot were provided by prosecutors or outlined in a brief, three-page grand jury indictment. Authorities said the case was not an FBI sting operation but declined any additional comment.