Police sealed off the area around Wainhouse Tower in Halifax yesterday to investigate an allegation of an attack on a young woman.
Detectives were called to the landmark’s grounds at around 8.30am.
They had received a report that a 28-year-old woman had been assaulted.
Entrances to the area were taped off and officers stood on guard for several hours. They say investigations are underway.
Wainhouse Tower, at 253-ft tall, originally a chimney is the highest structure in Calderdale and was built over four years between 1871 and 1875.