"There will be very substantial police presence at all protests. We are going to make sure there are plenty of officers to keep everyone safe so our officers have plenty of backup and support," de Blasio stated on Friday.
Five police officers were killed by a sniper in Dallas on Thursday night after a peaceful demonstration against the police killing of two African-American men in Louisiana and Minnesota. Another seven officers and two civilians were also shot in Dallas, but are expected to survive.
Earlier on Friday, the NYPD ordered all officers to work in pairs and remain vigilant.
De Blasio also said during the press conference that there is no known credible threat toward New York City or NYPD officers at this time.