Two men have been arrested over an explosion that damaged a Ulez camera in south-east London.
The blast happened in Sidcup on the evening of 6 December after a camera had been cut down shortly before.
Det Ch Supt Trevor Lawry said: "The explosion could easily have had far more harmful consequences."
The Met's Counter Terrorism Command arrested a 60-year-old man in Sidcup and a 61-year-old man in Horsham, West Sussex, earlier on Monday.
They were held on suspicion of conspiracy to cause an explosion likely to endanger life or property and remain in custody at a south London police station.
The 61-year-old was further arrested on suspicion of causing criminal damage.
Detectives are conducting searches at addresses in Sidcup and Horsham, the Met said.
The explosion, on Willersley Avenue in Sidcup, happened at about 18:45 GMT on 6 December.
Police believe a Ulez camera installed on the road earlier that day was cut down not long before the blast, at about 17:15.
It was further damaged in the explosion, which was caused by a "low-sophistication" improvised explosive device, the Met said. A residential property was also damaged in the explosion.
The Counter Terrorism Command is continuing to appeal for information and is looking for camera footage from anyone who drove or cycled on Willersley Avenue on the evening in question.
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