A twin bombing attack in a mosque claimed the lives of two people and 55 other injured.
The bomb blast, which took place during the Friday prayers, is suspected to have been triggered by Improvised Explosive Device, IED, at the Saad Ben Obadah in Libya.
NAN reports that on January 23, a twin vehicle bombing in Libya's eastern city of Benghazi killed 35, with about 60 people wounded. He does not support the government in the western capital Tripoli, back by the United Nations.
"This heinous act should not provide a justification for revenge attacks. Prompt, impartial investigations should bring perpetrators to justice".
Fears over potential reprisals are heightened by the reported summary execution of around 10 jihadist prisoners by a commander loyal to Haftar following last month's bombings.
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The fighting in Benghazi was part of a broader conflict that developed in Libya after former ruler Muammar Gaddafi was removed from power and killed in a NATO-backed uprising in 2011.
Mr al-Werfalli is wanted by the ICC for allegedly carrying out a number of similar killings.
Haftar, a possible contender in national elections that could be held by the end of 2018, has built his reputation on delivering stability in Benghazi and beyond, promising to halt the anarchy that ensued after a NATO-backed uprising ended Moammar Gadhafi's rule almost seven years ago.
Haftar, who opposes a UN-backed unity government based in Tripoli, announced Benghazi's "liberation" from jihadists in July last year after a three-year campaign, but sporadic violence has continued.
The UN has been trying to mediate for years, hoping elections could help stabilise Libya.