Home Secretary Theresa May on 'constant battle' against terror

Home Secretary Theresa May has said there is ''a constant battle'' against terrorism as perpetrators look for ''new ways'' to attack.

Mrs May's comments follow the arrest in Yemen of a female medical student suspected of posting bombs found on two cargo jets in Dubai and the UK.

She was held at a house in the capital, Sanaa, after being traced through a phone number left with a cargo company. Her mother was also detained.