Pakistan's largest opposition party said on Tuesday that two of its supporters have died from police use of tear gas to prevent hundreds of supporters from entering the capital, Islamabad, for a planned protest demanding the prime minister's accountibility. 

"Two of our workers have been killed due to excessive use of expired tear-gas shells," said Shah Mehmood Qureshi, a senior leader of opposition party Pakistan Tehreek-e-Insaf (PTI) on a news channel.

Local authorities could not immediately be reached to confirm any deaths.

Hundreds of supporters of the cricketer-turned-politician Imran Khan clashed with police overnight trying to enter the capital for a planned citywide shutdown on Wednesday.  -Reuters