Democratic presidential candidate, former Secretary of State Hillary Clinton speaks during a campaign rally on June 2 in El Centro, Calif. | Getty Clinton: 'I mourn for the officers shot'

Hillary Clinton's planned rally with Vice President Joe Biden in Scranton, Pennsylvania, on Friday has been postponed following the shootings in Dallas on Thursday night, the presumptive Democratic nominee's campaign announced.

"I mourn for the officers shot while doing their sacred duty to protect peaceful protesters, for their families & all who serve with them," Clinton tweeted after the postponement was announced.


Clinton had been expected to address the other recent shootings of Alton Sterling and Philando Castile, both black men shot by police officers in two high-profile incidents in Louisiana and Minnesota, respectively. Clinton's first event with President Barack Obama last month was postponed as well, following the deadly shooting at the Pulse nightclub in Orlando, Florida.

According to a Clinton aide, the former secretary of state had been set to "renew her calls to ensure justice is served and ... reemphasize the urgent need to reform our broken criminal justice system."

Clinton also canceled a fundraising event in Scranton, but is still expected to speak later at the African Methodist Episcopal Church conference in Philadelphia. Biden, who had also been scheduled to deliver remarks for Clinton at another private event later in the afternoon, will remain in Wilmington, Delaware, to meet with senior advisers.