The unnamed official said the deaths occurred as US forces launched a major attack involving air and ground components to kidnap Maduro.
"At least 40 people, including civilians and soldiers, were killed in the attack."
According to US officials quoted by the newspaper, the operation began with an overwhelming aerial assault to disable Venezuela’s air defenses before troops were inserted on the ground.
"More than 150 US aircraft were dispatched to knock out air defenses, so military helicopters could deliver troops who assaulted Mr. Maduro's position, US officials said," the report stated.
Meanwhile, there was no immediate public confirmation from the White House or the Pentagon regarding the number of casualties or the full scope of the military action.
Separately, US President Donald Trump announced that American forces had captured Maduro and his wife in a dramatic overnight operation early Saturday.
Trump said the United States would administer Venezuela until a "safe, proper, and judicious transition" is secured.
US federal prosecutors unsealed a new indictment accusing Maduro and his wife of trafficking "tons of cocaine" into the United States, along with other crimes.
The indictment was released early Saturday by prosecutors in the Southern District of New York.
Critics, however, warned that the operation represents a serious violation of international law, bypasses the US Congress, and risks plunging Venezuela and the wider region into deeper instability.