European Herring Gull
The European herring gull (Larus argentatus) is a large gull, up to 66 cm (26 in) long. One of the best-known of all gulls along the shores of Western Europe, it was once abundant. Northern Europe, Western Europe, Central Europe, Eastern Europe, Scandinavia, and the Baltic States are all regions where it breeds. Many European herring gulls are year-round residents, for example in Ireland, Britain, Iceland, or along the North Sea coastlines. Some, particularly those who live in harsher climates, move further south in the winter. They eat a variety of foods, such as fish, crabs, and some plants. They are also scavengers, eating carrion and food that humans have left behind or taken. They have razor-sharp, up to 2.6-inch long bills, and a wing span of 49 to 61 inches. So, the herring gull assaults did indeed result in serious injuries.
European herring gulls attack during the nesting season, much like other birds do. These birds strike as a group, so you should keep your distance. One herring gull will promptly appeal for assistance from other adult birds if it is alone and being disturbed. European herring gulls would launch a mass attack in response to such an occurrence.