NEW DELHI — Intense shelling erupted along the disputed border between India and Pakistan on Saturday, killing several civilians and making it clear that hostilities between the two nuclear-armed nations were hardly over — only a day after Pakistan handed over a captured Indian fighter pilot in what it called a “good-will gesture.”

At least five civilians and two soldiers were killed, according to officials on both sides.

At the same time, independent security analysts continue to question India’s claims this past week that it had killed “a very large number” of terrorists at a major training camp in a cross-border airstrike. The bold strike set off an enormous mobilization of Indian and Pakistani forces and a cycle of military attacks, bringing South Asia to red alert.

Michael Sheldon, a researcher at the Atlantic Council, a think tank in Washington, said on Saturday that after studying satellite imagery of the area in Pakistan that India had bombed, he could see “no evidence any buildings were hit.” He added, “It appears to me they didn’t hit their targets.”

Instead, he said, all publicly available evidence and accounts from witnesses on the ground indicated that the Indian bombs had landed in an unpopulated forest and had taken out some pine trees. He set out his argument in an online article titled “Surgical Strike in Pakistan a Botched Operation?”