Deleting using ormlite on android?

I have a Client bean ,

@DatabaseField(columnName = "client_id",generatedId = true,useGetSet = true)
private Integer clientId;
@DatabaseField(columnName = "client_nom",useGetSet = true)
private String clientNom;
@DatabaseField(columnName = "city_id",foreign = true,useGetSet = true)
private City city;

and a City bean ,

@DatabaseField(columnName = "city_id",generatedId = true,useGetSet = true)
private Integer cityId;
@DatabaseField(columnName = "city_name",useGetSet = true)
private String cityName;
@ForeignCollectionField
private ForeignCollection<Client> clientList;

Those beans are just an example but let's say , I want to delete all the clients having as foreign city cityId when deleting a city.

How is that possible please ?