"The death toll from the car bomb attacks outside Sweida has risen to 26 people. Another 50 people are wounded," said Rami Abdel Rahman, head of the Syrian Observatory for Human Rights yesterday.
Abdel Rahman earlier said that Sheikh Wahid al-Balous, who spoke out often against both the Syrian regime and Islamists, was killed in the attack as he was driving on the outskirts of the city.
Syria's official news agency SANA earlier said eight people had been killed and 22 wounded.
Sweida is the heartland of Syria's Druze minority, which made up around three per cent of the country's pre-war population of 23 million.
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"Balous was the leader of the Sheikhs of Dignity group, which aimed to protect the Druze areas in Syria," said Malek Abu Kheir, a journalist from Sweida who knew him.
The Sheikhs of Dignity are the most powerful militia in the area and had fought fierce battles against the Islamic State jihadist group and Al-Qaeda's Syrian affiliate.
Days before Balous was killed, Sweida residents had gathered in the city to demand more regular government services, including electricity and water.
Activists told AFP the protesters had the support of Balous.