ELMs have been observed by diagnostic systems with high spatial and temporal resolution in the ASDEX and JET tokamaks. During the ELMs, substructures exist in the scrape-off layer with sizes of 2-5cm and lifetimes in the order of 20-50ms. Their poloidal-temporal evolution is directly observed, and the radial transport due to turbulent ExB drift in these substructures is estimated. A comparison is made between "normal" fluctuations in between ELMs and these substructures in terms of poloidal size and velocity and related radial transport. The increased radial transport during ELMs is shown to be mainly due to these substructures. The observed uctuation amplitudes and velocities of the substructures are found to be compatible with the model of radial transport by plasma "blobs" and plasma potential gradients generated by the sheath boundary conditions. The transport due to turbulent radial ExB flows is compared during and in between ELMs, and the observation of ELM substructures in the main plasma scrape-off layer is put into context with the observation of substructures on the target plates.