The incident occurred about five kilometres from the town of Mangalla.
No one has claimed responsibility for the attack in Kandahar Province.
Government troops, backed by Russia and loyalist militia, has launched a ferocious assault more than a month ago to retake the enclave on the outskirts of Damascus.
The 25-truck convoy will bring food and medical aid to Douma.
International Committee of the Red Cross said that the current conditions prevented a convoy from delivering aid to Eastern Ghouta.
The bikers' group says sorry for not seeking local police aid to allow their convoy of 57 bikes to go through a traffic intersection in Narathiwat.
Bersih 2.0 chairman Maria Chin Abdullah says she chose to maintain silence during the 20 minutes of questioning at the Petaling Jaya police headquarters.
Maria Chin Abdullah says the police in several states nationwide set the standard in managing peaceful assemblies.
Red Shirts movement leader vows to continue 'attacking' Bersih 2.0's nationwide convoy promoting the upcoming Bersih 5 rally.
Red Shirts movement leader hands over evidence to police.
Bersih 2.0 claims it had known much earlier that PAS would not be participating in Nov 19 rally.
The Paralympians will be paraded around the federal capital on an 'open top bus' after a grand welcome at KLIA.