The brothers, who say they are innocent, are accused of having formed an organised criminal network in early 2021 in Romania, as well as in the US and Britain
The Syrian government has consistently denied using chemical weapons in the war, which will soon enter its eighth year having killed hundreds of thousands of people and forced half of Syria's pre-war population from their homes.
Russia, which backs the Assad government, accused rebels of preparing to use toxic agents in eastern Ghouta so they could later accuse Damascus of employing chemical weapons.
In recent weeks, the United States has accused Syria of repeatedly using chlorine gas as a weapon. Rebel-held areas of the Ghouta region were hit in a major chemical attack in 2013.
Last year, a joint inquiry by the United Nations and the Organisation for the Prohibition of Chemical Weapons (OPCW) found the Syrian government was responsible for an April 4, 2017, attack using the banned nerve agent sarin in the opposition-held town of Khan Sheikhoun, killing dozens.
The inquiry had previously found that Syrian government forces were responsible for three chlorine gas attacks in 2014 and 2015 and that Daesh militants had used mustard gas.
Elsewhere in Syria an air strike by the US-led coalition fighting Daesh killed 25 people - more than half of them women and children - in the militant group's last enclave on the Euphrates River in Syria, the Observatory said on Monday.
The brothers, who say they are innocent, are accused of having formed an organised criminal network in early 2021 in Romania, as well as in the US and Britain
The left-handed batter scored 3369 runs in 136 one-day internationals and 2893 in 140 Twenty20 internationals — both Pakistan records
Food supplies were distributed to 80 households
On January 31, a heart was airlifted from Delhi to Chennai, paving the way for Ayesha Rashid's life-saving surgery
The online retailer, which is headquartered in Singapore, has said it has around 108 million monthly active users in the 27-nation EU
The baby girl named Rouh, meaning Soul, suffered respiratory problems and a weak immune system, a doctor at the Emirati Hospital in Rafah said
Specialised teams are currently managing the situation by cleaning up and removing the dead fish
The charges against them include planning terrorist acts, fundraising for the Organisation, and concealing the source and destination of those funds