A record number of terrorist attacks were planned, foiled or carried out in European Union countries last year, with the UK reporting the highest number of attacks.

EU law enforcement agency Europol said there were 211 attacks in 2015, the highest since records began in 2006.

Of those, the UK had the highest with 103 attacks, thought mostly to have been in Northern Ireland.

The largest proportion of arrests in the EU were linked to jihadists.

The failed, foiled and completed terrorist attacks were in six EU member states - Denmark, France, Greece, Italy, Spain and the UK.

According to the agency's EU Terrorism Situation and Trend Report, 687 people were arrested for jihadist terrorism, of which 94% were found guilty.

'Worrying developments'

There were more than 1,000 arrests for terrorism-related offences, of which 424 were in France.

Europol said 151 people died and more 360 were injured in terrorist incidents last year.

In its report, Europol said: "As in previous years, the attacks specifically classified as separatist terrorism accounted for the largest proportion, followed by jihadist attacks."

Europol also said the report outlines two "worrying developments".

"The overall threat is reinforced by the substantial numbers of returned foreign terrorist fighters that many Member States now have on their soil, and the significant rise in nationalist (xenophobic), racist and anti-Semitic sentiments across the EU, each resulting in acts of right-wing extremism."

Europol said there is "no concrete evidence to date that terrorist travellers systematically use the flow of refugees to enter Europe unnoticed".

However, it notes that two of the men who carried out the Paris attacks in November entered the EU through Greece as part of the influx of refugees from Syria.