There were four Hs-293 launched from two different Fw-200 Condors. One missle was not reached harbour area and exploded on the field about one kilometer from Röyttä harbour. Then may be the second missle from that plane who shot that mentioned above, the second missle hit in shallow water at the harbour coastline and was not exploded.
Possible the second Fw-200 shot following two missles which they were targeting to ships who were waiting little bit farther off from harbour. One was missed a ship and exploded in the sea and the other also missed other ship and went to sea without exploding.
There were some claims where the amount of the missles shot is little bit different in different sources. The fact that only two of four missles exploded may caused a confusion among witnessess? Some says two were shot, some says three and some four.
Here is a photo little bit farther from Röyttä harbour taken three days earlier from that Hs-293 attack.