Officers from the Metropolitan Police Counter Terrorism Command, supported by the Territorial Support Group, arrested at an address in Barking, east London, last night.
"He was arrested on suspicion of being concerned in the commission, preparation or instigation of acts of terrorism under Section 41 of the Terrorism Act 2000. He has been taken into custody at a south London police station and is detained under the Terrorism Act," the Met Police statement said.
The latest arrest bring the number of arrests in the case to 21, with a total number of seven men in custody after the others were released without charge and one bailed to appear before court later this month.
Eight people were killed when three terrorists drove at pedestrians on London Bridge earlier this month and stabbed people in Borough Market.
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