Detectives investigating the disappearance of Claudia Lawrence have arrested a 59-year-old man from York on suspicion of murder.
Officers says forensic examinations and searches are taking place and will continue over a "number of days". A car has also been seized, as part of the inquiries.
The investigation team says it would like to stress that Claudia "has not been found" and they cannot rule out the "possibility of further arrests in the future".
More top news
The memorial service will be attended by Prince Harry and Meghan Markle.
David Browning admits manslaughter by diminished responsibility but denies murder.
Four people have died and the suspect is still at large, police said.