“No arrests have been made at this time.”
She confirmed that a 26-year-old man from Borehamwood was interviewed under caution, adding that investigations are on-going.
The alleged offence was reported to Jewish security group, the Community Security Trust.
CST director of communications Mark Gardner said: “CST received reports of antisemitic abuse being shouted by men in a van, as they drove past small groups of congregants leaving shul. We have the registration number and it is being followed up by police.”