Abhay and Aarti Tamore, members of the Aarey Conservation Group (ACG), were protesting hacking of trees in South Mumbai, where work is underway on a third corridor of Mumbai Metro.
In a bid to stop the contractor from hacking trees, the duo climbed on a tree, forcing him to stop the work.
Abhay and Aarti were briefly detained by police.
Other protesters assembled at the spot shouted slogans against the contractor and Mumbai Metro, alleged the tree feeling was not within stipulated norms.
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Aarti, an IT professional, said like-minded people would approach the Bombay High Court on Friday for a direction to stop disorderly cutting of trees.
Meanwhile, ACG alleged its members are not being allowed by the contractor to see the documents related to tree hacking.
Amrita Bhattacharjee, a member of ACG, said, "The contractor has claimed they have got orders to hack trees but they are not showing documents to anyone.