A cellphone has been found near the site of one of Friday's Paris shootings with a map of the music venue that was attacked and a text message on it saying words to the effect of "let's go", a source with knowledge of the investigations said.
Confirming reports on French web site Mediapart and U.S. television channel CNN, the source said the phone was found in a dustbin near the Bataclan concert hall where the bloodiest of the shootings took place.
At least 129 people died in the killings, including 89 at Bataclan. Islamic State has claimed responsibility for the co-ordinated suicide bombings and shootings.
The news came as it emerged that a Belgian fugitive suspected of taking part in the Paris attacks was stopped three times by French police while being driven back to Brussels the following morning but was allowed to carry on his way, a defence lawyer said on Tuesday.