HEBRON, West Bank ? Israeli forces today blew up the fortress-like Palestinian headquarters, leaving only rubble and apparently ending their 4-day-old standoff with wanted Palestinians who the army says were holed up inside, nearby residents said.

The Israel army would only say its operations were continuing in Hebron, but Palestinians living in four homes around the hilltop compound all said the building was no longer standing.

“I saw hills of rubble,” said Mohammed Maswadeh, whose windows were blown out by the blast about 120 yards away. “There’s nothing called the headquarters anymore.”

Military officials have said about 15 wanted men were believed to be holed up in the building. The army spokesman’s office refused to say whether soldiers had confirmed any deaths or if soldiers had learned anything more about the precise number of people inside.

Before the second blast, the Israeli army commented on the first, which residents said blew out about a quarter of the building. The army said its forces had rigged a part of the building where it believed the wanted men had been hiding, ignoring four days of calls to surrender.

The compound was surrounded early Tuesday as part of a West Bank military offensive that has confined 700,000 Palestinians to their homes while soldiers search for Palestinians suspected of links to deadly attacks on Israelis. The open-ended campaign, prompted by twin suicide bombings that killed 26 Israelis, began 10 days ago.

The compound, used in the past as a base for British, Jordanian and Israeli forces, today houses offices of the Palestinian Authority’s local governor and security forces. Scores of police officers had walked out of the building during the past four days, and the army said that 20 wanted men gave themselves up and were arrested.

Apache attack helicopters circled in the sky after the first explosion, which sent sparks high into the night sky. Smoke and fire could be seen then from a ground-floor corner, with flames flaring up the side of the four-story building before quickly dying down and out. Even before the explosions, the building had been badly damaged by missile fire and military bulldozers.

Fog settled in over the area before the second blast, and electricity failures in the area made it difficult to see the extent of damage. Curfews and an Israeli military order barring journalists made it impossible to approach.

But neighbors got a better view. Maswadeh compared the second blast to an earthquake, saying everything in his house shook: “I’d never seen an explosion like that. The cars nearby blew into the air and dropped down.”

Israel has raided seven of the eight major Palestinian cities in the West Bank. The army decided Friday to allow journalists, who have been banned from the besieged cities for 10 days, to work in six of them. Journalists remain barred from Hebron because of ongoing military operations, the army said.