"6 inc.(including) a woman & 12 yr (year) old boy are dead sir. They're part of your #TeamIndia. As captain of the team your silence is hurtful sir @PMOIndia," Omar wrote on twitter.
The working president of the opposition National Conference (NC) earlier said he was "sorry" to see that the Prime Minister could not tweet a condolence message after people were killed in the shelling.
"So sorry to see that my PM, who remembers to tweet for every obscure birthday & National Day can't tweet a condolence for the dead today," he said.
"So far my father is the only senior person to visit this area in Poonch to boost morale. High time Ministers of Center & State visit now," he said.
Omar also lashed out at Minister of state in the Prime Minister's Office Jitendra Singh, saying he was "heaping insult on injury".
"Someone please get him to keep quiet. He's heaping insult on injury now," Omar tweeted after Singh reportedly said that "people living along borders now feel much more secure than ever before".