A special National Investigation Agency (NIA) court in Jagdalpur in Chhattisgarh ’s Bastar district on Wednesday sentenced all 10 convicts in the 2013 Jhiram Valley Maoist Attack case to death, 13 years after an ambush on a Congress Parivartan Yatra convoy in Bastar killed 27 people, including senior Congress Leaders, and injured more than 35.