By Hamdi Alkhshali and Ruba Alhenawi, CNN(CNN) — At least 55 people were killed and 146 others injured when clashes broke out between two powerful armed factions in the southern Libyan capital of Tripoli, emergency services spokesman Malik Marseet told local media outlets on Wednesday. He was apprehended by a rival faction, the Special Deterrence Force, which controls the airport. The clashes ceased late on Tuesday following an agreement reached with the UN-recognized Government of National Unity to transfer Hamza to a neutral party, as reported by state news agency LANA. The fighting is considered the most severe of this year with images showing smoke rising above the capital following the overnight battles. The Special Deterrence Force and the 444 Brigade are considered the strongest military forces in the Libyan capital, according to Reuters.