The first bombs fell at 19:23. Some 350 bombs fell within the city and approximately 2,500 bombs outside Helsinki. The total number of bombs dropped (included the ones that fell into the sea) amounted to some 6,990. Approximately 730 bomber aircraft participated in the raid. The bombers arrived in two waves: 18:51–21:40 on 6 February, and 00:57–04:57 on 7 February. Most of the damage was done in the district of Skatudden, and the streets Porthaninkatu, Kasarmikatu, Kajsaniemigatan and Berggatan suffered considerable bomb damage as well, and the Technical University (Tekniska högskulan) at Sandvikstorget was destroyed.