The Paris prosecutor said neither he nor suspect Salah Abdeslam were among eight people arrested, but at least two bodies had still to be identified.
Meanwhile, French MPs are due to vote on extending a state of emergency.
Militant group Islamic State (IS), which controls parts of Syria and Iraq, has said it was behind the attacks last Friday, when gunmen and suicide bombers killed 129 people and injured hundreds.
The Washington Post quoted unnamed European officials as saying Abaaoud, 27, had been killed on Wednesday when heavily armed police stormed the building in the suburb of Saint Denis.
However, Paris prosecutor Francois Molins had earlier said he could not give "a precise and definitive number for the people who died, nor their identities, but there are at least two dead people".
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