Photos: Before and after aerials of the Syria strike

WASHINGTON — Allied missiles struck at the heart of the Syrian chemical weapons arsenal, aiming to punish the Assad government for a suspected poison gas attack against civilians and deter the possible future use of such banned weapons.

Pentagon officials said the assault pummeled, but did not eliminate the Syrian program.

“A perfectly executed strike,” President Donald Trump tweeted Saturday in the aftermath of his second decision in just more than a year to attack Syria. “Could not have had a better result. Mission Accomplished!”

By late Saturday in Washington, more than 12 hours after the attack, neither Syria nor its Russian or Iranian allies had retaliated, Pentagon officials said.