Five acid attacks took place in London late on Thursday night, local media reported.
Footage from the location of one of the incidents in the borough of Hackney showed a stationary moped by a police cordon.
According to reports, the attacks began at 22.25 local time (21.25 GMT) when two men riding a moped threw a corrosive substance at another man riding a moped in Hackney before stealing his vehicle.
Similar attacks were then reported in other areas of north-east London.
Local media reported that detectives were treating the incidents as linked, and one person was being held at a police station on suspicion of grevious bodily harm and robbery.
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