The incident happened at around 6.30pm, where security at the sanctuary heard gunshots and rushed towards the direction of the sounds but failed to see the suspected poachers.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/three-rhinos-killed-poachers-kenyas-meru-national-park-ministry
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/reuters-africa
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wildlife
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/poaching
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rhinoceros
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kenya
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/endangered-species
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa