Olowan Magarang recalls the moment he knew it was time to flee his home in Marawi, on the southern Philippines' island of Mindanao. It was in May 2017, two days into a siege by militants aligned with the Islamic State.

"I spotted ISIS fighters moving up my brother's four-story house, carrying long guns and high-caliber weapons," he says.

Magarang was living in what became ground zero — the epicenter of months of fighting — when Philippine troops waged house-to-house combat against hundreds of ISIS-affiliated fighters in Marawi.

Authorities allowed him to see the ruins of his concrete house for the first time last August.

Read more: NPR