UPDATE 16:08: Incident cleared and road now fully open.
UPDATE 14:34: A spokeswoman from South Wales Fire and Rescue has confirmed that two vehicles were involved. One child was removed from a vehicle and a second casualty was removed after the roof was cut away by the fire service. All lanes are now open.
EMERGENCY services are attending a crash between J26 and J25 east bound on the M4 near to the exit of the Brynglas tunnels.
Fire crews were called to the incident at 12.45 and remain in attendance with ambulance services also.
Two lanes have been closed eastbound and delays are expected with reported tailbacks between J27 and J28.