U.S. lawmakers were also shown transcripts of the communications intercepts of Syrian officials discussing the attack both before and afterward including a conversation where one Syrian commander told the military's chemical weapons unit to cease firing, because they'd done enough damage, according to a congressional official.
The intelligence official said the U.S. is not going to release those transcripts, in part because foreign intelligence agencies provided some of the material.
The Obama administration also said it had established that rockets were fired from a regime-held area into rebel-held areas through satellite imagery, but such imagery has not been shown to lawmakers, though the congressional official said they will ask to see it.
Both officials spoke on condition of anonymity because they were not authorized to discuss how they obtained the intelligence publicly.
At the United Nations, Ban said President Bashar Assad's regime "has committed many crimes against humanity," though he did not refer specifically to chemical weapons attacks.
"Therefore, I'm sure that there will be surely the process of accountability when everything is over," he said.
U.N. associate spokesman Farhan Haq said that while the report still hasn't been completed, Ban "has been in touch with different people including the experts."
The secretary-general spoke at the Women's International Forum. He thought his speech and his responses to questions that followed were not being broadcast, but they were shown on U.N. television.
Speaking by telephone from the Netherlands, Sellstrom said he didn't know exactly when the report would be released publicly. He said that "it's done, but when to present it is up to the secretary-general." But in a later conversation Friday, Sellstrom said he wasn't quite finished with the report, and that what he meant was that it would be done once he delivered it to Ban this weekend.
The two U.N. diplomats said the inspectors had soil, blood and urine samples and may also have collected remnants of the rockets or other weapons used in the attack, which could point to those responsible. The diplomats spoke on condition of anonymity because discussions on the issue have been confidential.
Haq said after receiving the report, Ban will present it U.N. member states and that the media should receive it shortly afterward.
In his speech, Ban said "the disaster" in Syria has created "a lost generation of children and young people" and led to "rising sectarian tensions, regional instability, the largest displacements of people in a generation, grave violations of human rights, including sexual violence."
"The latest fighting has also raised the specter of chemical warfare which, if confirmed by the U.N. investigation mission, would be an atrocious violation of international law," Ban said.
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Associated Press writers Karl Ritter in Stockholm, Maria Sanminiatelli at the United Nations, and AP Intelligence writer Kimberly Dozier in Washington contributed to this story.