More than 200 terror attacks were planned, thwarted or carried out in Europe last year as the continent faced a mounting threat from violent extremism.
There were 211 "failed, foiled or completed" terrorist strikes reported by six member states - with the highest number logged by the UK, according to Europol.
Some 151 people died and more than 360 were injured as a result of terrorism - with the vast majority of fatalities in France, which was hit by the Charlie Hebdo and Paris atrocities in 2015.
The figures are "markedly higher" than in 2014, when four people were killed and six wounded, Europol said.
The EU law enforcement agency's latest Terrorism Situation And Trend Report said the total number of terrorist incidents across the EU in 2015 slightly increased compared with 2014, when there were 201.
Denmark, France, Greece, Italy, Spain and the UK reported failed, foiled and completed attacks.
The report said the UK reported the highest number - 103. It is understood this figure relates to Northern Ireland.
The report also said a significant percentage of all foreign "terrorist travellers" in Syria/Iraq are now female, there is no concrete evidence to date that terrorist travellers systematically use the flow of refugees to enter Europe unnoticed, and in 2015, a total of 1,077 individuals were arrested on suspicion of terrorism-related offences compared with 774 in the previous year.
The threat from international terrorism in the UK is currently assessed as severe, indicating that an attack is highly likely.