Organizers say the advice of authorities and an adjacent rally for the rights of Palestinian civilians caught in the middle of a war between Israel and the terrorist group Hamas were enough to cancel a planned march of Jewish groups through Boston Sunday.

A column of empty baby strollers and wheelchairs symbolizing over 240 kidnapped Israelis had been scheduled to roll along the city’s Freedom Trail, in an event apparently organized by the The Anti-Defamation League, Jewish Community Relations Council and Hostages and Missing Families Forum. It will instead take place some other unspecified time, according to an auto-reply from the event’s contact email.

“Because of heightened security concerns and expected pro-Palestinian rally downtown tomorrow, we have been advised by multiple authorities to postpone the Stroller March. We very much appreciate everyone’s support,” the group wrote, asking followers to “stay tuned” for updates on a future event.

A rally organized by the Boston Coalition for Palestine kicked off around 1 p.m. in Boston in front of the Public Library, with thousands in attendance.

According to organizers that event was held to “express unwavering solidarity with the Palestinian people and reiterate key demands for immediate global attention.”

The canceled Freedom Trail march, according to the event posting on JewishBoston.com, aimed to “draw attention from the public,” to remind people of those still in captivity, and demand their immediate release.

“For over a month, Hamas has been holding people who have been gravely traumatized, raped and severely injured. The hostages include babies and small children, teenagers who were kidnapped from a dance party, men, women and the elderly,” organizers wrote. “The march will be led by people pushing empty strollers with posters of the kidnapped infants and toddlers, as well as wheelchairs with posters of the kidnapped elderly.”