Detectives are also investigating another attack that occurred yesterday in the Waterside area.
A woman was walking her dog in Top of the Hill Park shortly before 3pm when she was approached by a man armed with a kitchen knife.
The man grabbed at the woman but she called out and swung her dog lead at him, prompting him to run off.
He is described as a white man in his 20s, around 5’ 11” tall with a slim build and was wearing all black clothing. He had his hoody pulled tight around his face.
Detectives are investigating the possibility that this attack is linked to a similar attack in Drumahoe on Friday night.
