Iran is recruiting a hacker army to target the U.S. power grid, water systems and other vital infrastructure for cyberattack in a future confrontation with the United States, security specialists will warn Congress Thursday.

“Elements of the IRGC [Iranian Revolutionary Guard Corps] have openly sought to pull hackers into the fold” of a religiously motivated cyberarmy, according to Frank J. Cilluffo, director of the Homeland Security Policy Institute at George Washington University.

Lawmakers from two House Homeland Security subcommittees will hold a joint hearing Thursday about the cyberthreat posed by Iran, as tensions over Tehran’s nuclear program continue at a high level, and a possible Israeli strike looms.