I’m an American doctor who went to Gaza. What I saw wasn’t war — it was annihilation.

In late January, I left my home in Virginia, where I work as a plastic and reconstructive surgeon and joined a group of physicians and nurses traveling to Egypt with the humanitarian aid group MedGlobal to volunteer in Gaza.

I have worked in other war zones. But what I witnessed during the next 10 days in Gaza was not war — it was annihilation. At least 28,000 Palestinians have been killed in Israel’s bombardment of Gaza. From Cairo, Egypt’s capital, we drove 12 hours east to the Rafah border. We passed miles of parked humanitarian aid trucks because they weren’t allowed into Gaza. Aside from my team and other envoy members from the United Nations and World Health Organization, there were very few others there.

Entering southern Gaza on Jan. 29, where many have fled from the north, felt like the first pages of a dystopian novel. Our ears were numb with the constant humming of what I was told were the surveillance drones that circled constantly. Our noses were consumed with the stench of 1 million displaced humans living in close proximity without adequate sanitation. Our eyes got lost in the sea of tents. We stayed at a guest house in Rafah. Our first night was cold, and many of us couldn’t sleep. We stood on the balcony listening to the bombs, and seeing the smoke rise from Khan Yunis.

On one occasion, a handful of children, all about ages 5 to 8, were carried to the emergency room by their parents. All had single sniper shots to the head. These families were returning to their homes in Khan Yunis, about 2.5 miles away…   from the hospital, after Israeli tanks had withdrawn. But the snipers apparently stayed behind. None of these children survived.

On my last day, as I returned to the guest house where locals knew foreigners were staying, a young boy ran up and handed me a small gift. It was a rock from the beach, with an Arabic inscription written with a marker: “From Gaza, With Love, Despite the Pain.” As I stood on the balcony looking out at Rafah for the last time, we could hear the drones, bombings and bursts of machine-gun fire, but something was different this time: The sounds were louder, the explosions were closer.

This week, Israeli forces raided another large hospital in Gaza, and they’re planning a ground offensive in Rafah. I feel incredibly guilty that I was able to leave while millions are forced to endure the nightmare in Gaza. As an American, I think of our tax dollars paying for the weapons that likely injured my patients there. Already driven from their homes, these people have nowhere else to turn.