There is a "huge risk of terrorist attacks in the European Union" over the coming holiday season, a senior EU official has said.
European Home Affairs Commission Ylva Johansson said the polarisation in society caused by the Israel-Hamas war was increasing the risk of violence.
Her remarks came days after a tourist was fatally stabbed in Paris.
The EU was making an additional €30m (£26m) available for additional security, Ms Johansson said.
She did not specify whether there was any specific information which had led to the warning.
"We saw it recently in Paris, unfortunately we have seen it earlier as well," she added ahead of a meeting of EU interior ministers.
A similar warning came from German Interior Minister Nancy Faeser who told reporters the EU had to keep a close eye on threats and propaganda, as there was a high "risk of further emotionalisation and radicalisation of violent Islamist perpetrators".
Many European countries have seen a surge in hate crimes since Hamas gunmen attacked Israeli communities, leaving about 1,200 people dead and many others held hostage in Gaza. Israel's invasion of Gaza has since left more than 15,000 people dead, according to the Hamas-run health ministry.
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