A third person has been arrested in connection with an attempted arson attack at Finchley Reform Synagogue in north London, the Metropolitan Police said.
The 19-year-old man was arrested at an address in Portsmouth on Thursday on suspicion of attempted arson as part of an investigation being led by Counter Terrorism Policing London.
He remains in custody.
No damage was caused to the building and no injuries were reported after police were called to Fallow Court Avenue in Finchley in the early hours of April 15.
A 38-year-old woman and a 46-year-old man were arrested at an address in Watford on suspicion of arson endangering life on the same day of the incident.
They are on bail to a date in July.
Commander Helen Flanagan, head of CTP London, said: “We are continuing to make progress in all our ongoing investigations linked to various recent arson attacks across London.
“Counter-terrorism officers continue to work closely with our colleagues in the Metropolitan Police in response to the incidents. We’re providing protective security advice and support to various organisations, community venues and businesses.
“With the threat level now raised to severe, everyone can play their part to keep themselves and their communities safe. If you have concerns about someone behaving suspiciously, please report it to us. Your information could help us save lives.”
The arrest follows a number of attacks across London in recent months including the Golders Green stabbing last week and the arson attack on four Jewish community ambulances in March.
A total of 30 people have been arrested as part of the CTP investigations connected to the incidents, the Met said.
Eight have been charged with various offences and a 17-year-old boy has pleaded guilty to arson in connection with an attack at Kenton United Synagogue in Harrow on April 18.
The most recent incident was an arson at a former synagogue in east London on Tuesday.
The former synagogue in Whitechapel was due to be sold at auction earlier this year, with a separate bid by a Muslim group to buy the building and convert it into a mosque and community centre.
“Detectives investigating are aware of the potential change of use of this building and keeping an open mind as to any motivation behind this incident,” the force said.
No arrests have been made in connection with the incident.
