The move has further triggered the speculation that they are likely to be hanged soon.
An officer in Tihar jail also said that the maintenance of ‘phansi kothi’ has started.
Meanwhile, the chief secretary of Delhi government met with the union home secretary at his office on Tuesday. As per sources the two held important discussion over the convicts of the Nirbhaya case.
Also, a jail in Buxar district of Bihar, has been directed to keep 10 pieces ready by the end of this week, triggering speculations that these might be meant for the 2012 Nirbhaya case convicts.
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The Buxar jail which known for its expertise in manufacturing execution ropes is the only prison in the state having the required knowhow.
It received an instruction to the effect last week, though it was not known where these ropes - strong with a short shelf-life - would be dispatched.
Speculation was rife that four convicts of the gang-rape case of December 16 2012, when the young woman died after being raped and brutalised inside a moving bus in Delhi, could be hanged later this month.
The convicts were expected to be hanged after the rejection of mercy plea filed by Vinay Kumar by the president. However, on Saturday he sought immediate withdrawal of his mercy plea from President Ram Nath Kovind, saying it was sent without his consent.
Another one of the convicts Akshay Thakur filed his review petition in Supreme Court on Monday.