Three other people have been critically injured in the accident, which occurred after a car being chased by the police crashed into another vehicle.
Councillor Michael Long said: “This is a terrible tragedy and my thoughts are with the victims and their families at this time.
“Sadly October has brought a rise in the number of people who have lost their lives on the road and this latest incident again highlights the need for everyone to exercise caution when using the roads.
“The police ombudsman has launched an investigation and we must allow that to take its course, but I would call on anyone with information to get in touch with the PSNI as soon as possible.”