France is increasing security at religious sites as the interior minister said on Tuesday the country faces a "very high" risk of terrorist threats, amid growing geopolitical tensions following the beheading of a teacher who showed his class caricatures of the Prophet Muhammad.

French diplomats are trying to quell anger in Turkey and Arab nations amid anti-France protests and calls for boycotts of French goods in response to President Emmanuel Macron's firm stance against Islamism in the wake of the October 16 beheading.