Unit 4400

Unit 4400 is a clandestine logistics and finance division within Hezbollah, the Lebanese Shiite militant group designated as a terrorist organization by multiple countries, including the United States and Israel. This unit is primarily responsible for smuggling weapons and transferring funds from Iran to Hezbollah in Lebanon, often coordinating closely with Iran’s Islamic Revolutionary Guard Corps–Quds Force (IRGC-QF).^[1][2][3]

Overview

Unit 4400 plays a critical role in Hezbollah’s military infrastructure by facilitating the movement of arms, equipment, and financial resources. The unit operates through various channels, including land routes via Syria and air routes through Beirut’s Rafic Hariri International Airport. It collaborates with IRGC-QF units such as Unit 190 and Unit 700 to ensure the continuous supply of military assets to Hezbollah.^[2][4][5]

Leadership

• Muhammad Jafar Qasir (Sheikh Salah). Muhammad Jafar Qasir AKA Shiek Salah is a senior Hezbollah official who led Unit 4400 for approximately 15 years. He was instrumental in managing Hezbollah’s financial and logistical networks in coordination with the IRGC-QF. Qasir was designated as a Specially Designated Global Terrorist by the U.S. Treasury Department in 2018 and was killed in an Israeli airstrike in Beirut on October 1, 2024.^[6][2][5]
• Hussein Ali Nasr (Abu Ali Hassan). Hussien Ali Nasr served as the deputy head of Unit 4400. He was responsible for smuggling weapons and funds into Lebanon, often utilizing Beirut’s international airport and collaborating with Iranian operatives. Nasr was killed in an Israeli airstrike in southern Lebanon on April 20, 2025.^[7][8][3]

Operations and activities

Unit 4400’s operations are vital to Hezbollah’s capacity to maintain and expand its military capabilities. The unit oversees the transportation of advanced weaponry, including precision-guided missiles, and manages financial transactions that fund Hezbollah’s activities. Its logistical network spans multiple countries, leveraging both official and covert channels to move resources.^[1]

International designations and sanctions

Due to its involvement in terrorism-related activities, Unit 4400 and its key personnel have been subject to international sanctions. The U.S. Department of the Treasury has designated leaders like Muhammad Jafar Qasir as Specially Designated Global Terrorists, citing their roles in facilitating the movement of weapons and funds in support of Hezbollah and the IRGC-QF.^[1]

Recent developments

The targeted killings of Unit 4400’s leadership by Israeli forces underscore the unit’s significance within Hezbollah’s operational structure. These actions aim to disrupt the flow of arms and funds to Hezbollah, thereby weakening its military capabilities. The elimination of figures like Qasir and Nasr represents a strategic effort to dismantle Hezbollah’s logistical networks.^[9][8][10]

See also

• Unit 121
• Unit 900
• Unit 910
• Unit 190