Police are continuing their hunt for a man who sexually assaulted a teenage girl in a quiet country lane.
The girl, 16, reported the attack to Humberside Police in the early hours of Sunday morning.
The lane near Burton Road, Hornsea, was cordoned off while police searched for clues.
It is believed the attack happened at about 3am on Sunday.
The youngster has told police she was waiting for a taxi.
A Humberside Police spokesman said: "While down this alley, she was allegedly approached by a man, who pushed her to the floor and used force to inappropriately touch her.
"The victim resisted and the man ran off in an unknown direction."
Police were called about the alleged attack three hours later, at about 6am. The incident is being investigated as an attempted sexual assault.
The force spokesman said: "The victim was not hurt during the incident, however specially trained officers have spoken to the victim and are treating the incident as a sexual assault.
"At this stage, there is no description of the offender."
In the daytime, that area of Hornsea is well used by dog walkers.
Throughout Sunday the scene was cordoned off with police tape.
A team made up of local officers and specially trained scenes of crime officers scoured the area looking for clues. They were on scene from 9.45am to about 5pm.
At the same time, officers trained to deal with the victims of alleged sexual offences have been interviewing the teenage girl to piece together her recollections of what happened.
The force spokesman said: "We've had specially trained officers with the young girl. When someone is such a young age, we don't rush things."
Officers investigating the alleged sexual assault are appealing to anyone in the Burton Road area of Hornsea who heard or saw anything suspicious between 3am and 5.45am on Sunday to call Humberside Police.
They should call the non emergency number 101, quoting crime reference number CS/1958567/2013.
The attack has also prompted police to issue safety tips.
The advice is based on guidance from the Suzy Lamplugh Trust, which was set up by the parents of a 25-year-old estate agent who went missing.
The trust urges people to:• Plan ahead – think about how you are going to get home. Can you travel home with a friend? What time does the last bus or train leave?• Avoid danger spots like quiet or badly-lit alleyways, subways or isolated car parks.• If you do have to pass danger spots, think about what you would do if you felt threatened.• Consider heading for a public place, somewhere you know there will be other people.• Avoid passing stationary cars with their engines running and people sitting in them.• Try to keep both hands free and don't walk with your hands in your pockets.• Keep your mind on your surroundings – remember if you are chatting on your mobile phone or wearing earphones, you will not hear trouble approaching.• Beware of someone who warns you of the danger of walking alone and then offers to accompany you. This is a ploy some attackers have been known to use.• Consider carrying a personal safety alarm.
