New Delhi: Mercy petitions of six convicts, including Surendra Koli who was found guilty in the Nithari serial rapes and killings, have been rejected by President Pranab Mukherjee following recommendations from the home ministry, officials said.

Koli was handed the death sentence for luring and brutally killing young children in Nithari area of Noida in 2005-2006. The Supreme Court had upheld the sentence in February 2011.