Portuguese police are still gathering evidence in their investigation into the disappearance of Madeleine McCann and have not yet decided whether to bring charges or drop the case, Portugal's most senior detective said Saturday.

The British girl vanished from this resort town in southern Portugal one year ago Saturday, a few days before her fourth birthday.

"At this stage nothing has been determined regarding possible charges or closing the case," Alipio Ribeiro, head of the Policia Judiciaria investigative department, told the Portuguese national news agency Lusa.

"The PJ continues to gather and analyze all available evidence," Ribeiro was quoted as saying.

Police have named her parents, Kate and Gerry, and local man Robert Murat as formal suspects in the case. They have all denied involvement.

Church services were due to be held in Praia da Luz and at the McCanns' home town in England to mark the one-year anniversary.

Kate and Gerry McCann, who launched a worldwide online campaign to find their daughter, were not expected to travel to Portugal for the service. They returned to England in September, a few days after they were named as suspects.

However, Kate McCann has written a message that is to be read out during the service at the beachside chapel in Praia da Luz and Gerry McCann's brother was expected to attend.

The service was to be given by Father Haynes Hubbard, the Anglican vicar of Portugal's Algarve region. He still wears a plastic yellow Find Madeleine campaign bracelet on his wrist.

In England, the Archbishop of York has penned a special prayer for Madeleine McCann to mark the anniversary.