STEREO SECCHI EUVI-A images showing the magnetic field configuration of the active region in the 284 Å channel before a) and during c) the flare. For comparison, the approximate positions of the magnetic structures are marked by +. The position of the filament activation is drawn by using AIA 131 Å image at 07:00 UT. The limb position from the AIA image is overplotted on SECCHI images (white dotted lines). AIA 94 Å images (b) and d)) of the eruption site.