The Northern line has been suspended while a dog is rescued from the tracks. 

Services were disrupted at about 10.45am with one passenger saying an announcement of a 'trespasser' on the tracks had been broadcast. 

It has since been confirmed on Twitter that a dog is being rescued. 

Wandsworth Times:

Services are suspended from Morden to Kennington.

There is no estimate on when the situation will be resolved and passengers are advised to use alternatives routes.