Police were called to a report of a woman with a knife threatening to harm herself and others at an address on Harcourt Street in Hartlepool shortly before 6.30pm on Sunday 26th January 2014.
Emergency services, including specially trained officers attended the address, and the woman came out of the house shortly before 7.30pm.
The 25 year old woman has been detained under the Mental Health Act and has been taken to hospital.
A 42 year old man has been arrested following an allegation of assault and will be questioned by police.
No-one was injured in the incident, and enquiries are ongoing.