Police said neither bottle ignited and no damage or injuries were reported.
British prosecutors earlier this month charged three suspects — ages 17, 19 and 20 — in an alleged arson attack targeting Jewish community ambulances in north London.
The March 23 incident unfolded at around 1:45 a.m. in the Golders Green neighborhood, where four ambulances operated by a volunteer emergency service serving the Jewish community were deliberately set ablaze in a synagogue parking lot.
In the latest incident, the Metropolitan Police said no arrests have been made as of Wednesday afternoon local time.
"If you have any CCTV, dash cam footage or information that could help officers please contact the police," Williams said.
"Residents can expect to see a heightened police presence in the area over the coming days. We have brought in additional officers and would urge anyone with concerns to speak to them," he added.
Fox News Digital’s Sophia Compton contributed to this report.