The bodies, which were not publicly identified, were in the same area where Carter Rhoad and Australians Jake and Callum Robinson were reported missing.
Palestinian residents of the Nur Shams refugee camp said at least three people were summarily executed or used as human shields, claims Israel's military denies.
A win by Claudia Sheinbaum, protégé of Andrés Manuel López Obrador, could cement the grip of a party that already controls the presidency, both chambers of congress and two-thirds of Mexico's governorships.
The exhibition comes just ahead of a May 9 Victory Day celebration that is very different from last year's, when Russia was facing battlefield setbacks.
Secretary of State Antony Blinken urged Qatar's prime minister to expel Hamas's political leaders if the group rejects Israel's latest cease-fire proposal.
Prime Minister Justin Trudeau said last year that authorities were pursuing "credible allegations" linking the Indian government to the slaying of Hardeep Singh Nijjar.
Israeli air strikes and bulldozers have destroyed key parts of Gaza's food infrastructure, including agricultural land, olive and fruit trees and greenhouses.