Yemen Raid That Likely Killed Civilians Was 'Well Thought Out,' White House Says

"This was a very, very well thought out and executed effort," Sean Spicer said.

— -- The White House characterized Sunday's deadly raid in Yemen that likely killed civilians as "a very, very well thought out and executed effort."

The U.S. military concluded Wednesday that the raid, in which at least 14 AQAP fighters were killed, also "likely killed" civilians, possibly including children.

"A team designated by the operational task force commander has concluded regrettably that civilian non-combatants were likely killed in the midst of a firefight during a raid in Yemen Jan. 29. Casualties may include children," read a statement from the U.S. Central Command.

However, a counterterrorism official familiar with the operation's details and after-action assessments told ABC News Thursday, "There definitely were civilian casualties."

"An attack on a village in Yemen ordered by President Trump on Sunday caused the death of a newborn baby, alongside as many as 23 civilians," Reprieve said in a press release.

Alice Gillham, the press and communications officer at Reprieve, told ABC News that the organization arrived at that figure from speaking to local human rights organizations, as well as people in the village.

Spicer insisted Thursday that the raid was successful despite allegations of civilian casualties.

"It's hard to ever call something a complete success when you have the loss of life or people injured. But ... it is a successful operation by all standards," Spicer said.

"So he was kept apprised of the situation throughout the evening," Spicer said.

According to a U.S. official, an intercept indicated that someone within the vicinity of the al-Qaeda compound may have heard aircraft approaching.

One Navy SEAL was also killed in the raid, which left three other SEALs wounded.

Davis said the U.S. Central Command is investigating whether civilians were killed in the raid.

ABC News' Katherine Faulders and Jordyn Phelps contributed to this report.

Editor's note: An earlier version of this story misstated the number of civilian deaths in the raid. Reprieve says it has accounted for 23 civilian deaths.