A 61-year-old man is being questioned about a series of Islamophobic incidents at the Palestinian Mission in Hammersmith and mosques and businesses across west London.
The man, from Ealing, was arrested on Monday November 27 on suspicion of racially aggravated criminal damage after red paint was thrown or sprayed at the locations.
The offences took place in the boroughs of Hammersmith and Fulham, and Ealing on 12 separate occasions between Monday October 16 and Saturday November 18.
Detective Superintendent Figo Forouzan, leading the investigation, said: “Hate crime has no place in London.
"Its effects run far deeper than property damage, and the impact on victims can linger beyond the removal of the paint. Officers have been working incredibly hard to identify the individual responsible for these offences and provide the relevant support and reassurance to those affected.
“The victims are being supported by dedicated faith officers, and neighbourhood teams have changed their patrol times and routes to provide additional reassurance.”
It comes amid increasing Islamophobic and antisemitic hate crimes in the capital.
In October, the Met Police said it recorded a 1,353% increase in antisemitic offences compared to the same period last year, while Islamophobic offences were up 140% in the wake of the attack by Hamas on Israel.
The Community Security Trust, a charity that advises Britain's estimated 280,000 Jews on security matters, said it had recorded 457 antisemitic incidents across the UK since the Hamas attack on October 7 until October 18.
TellMama, which monitors anti-Muslim incidents, said it had received 200 cases up to October 16.