The police have reassured the Jewish community after the attempted bomb attack on a commuter train at Parsons Green in west London on Friday morning.
The Community Security Trust contacted Scotland Yard and was told that there, at this stage, there was "no evidence that the explosion has any connection" to Jews in London.
But CST warned the community to be on its guard following the incident.
“Nevertheless, given the current high terror threat level and the potential for attacks against multiple targets, including against the Jewish community, we urge everybody to be vigilant, to report anything suspicious and to follow all security protocols and instructions if you are visiting a Jewish location,” said a CST spokesperson.