Da Joooos don’t mess around.

(JPost) — A senior Hamas operative has been assassinated in his Damascus apartment, the Islamist terror group announced Wednesday evening.

According to a statement by a member of Hamas’ politburo, the organization did not know who was responsible for the death of Kamal Ranaja, known as Nizzar Abu-Mujhad, but was launching an investigation to discover who is behind the “despicable crime.”

There was no word about the manner in which Ranaja met his death. No Hamas official has yet pointed a finger at any third party, such as Israel or the Assad regime.

However, shortly after his death was announced, the new pan-Arabic television station Al-Mayadeen reported that he used to serve as aide to Mahmoud al-Mabhouh, a senior Hamas member who took part in several terror attacks and was also involved in kidnapping and killing IDF soldiers. Mabhouh was assassinated in Dubai in 2010. The deed was laid at the door of Mossad, which never confirmed or denied the accusation.

Mabhouh was responsible for smuggling weapons into the Gaza Strip from Iran.

The news of Rajana’s assassination comes on the heels of former Izz al-Din al-Qassam Brigades commander Ibrahim Hamed’s conviction for 46 counts of murder earlier Wednesday.