A powerful blast ripped through a pickup truck in the south Syria province of Daraa early Wednesday, killing 21 people including four children, the opposing UK-based Syrian Observatory for Human Rights said.

A powerful blast ripped through a pickup truck in the south Syria province of Daraa early Wednesday, killing 21 people including four children, the opposing UK-based Syrian Observatory for Human Rights said.

"Twenty-one people were killed in the Nawa area (of Daraa), among them four children and six women, in a blast that detonated as their vehicle went past Tal al-Jumua," it added.