Illegal immigration is the migration of people across national borders in a way that violates the immigration laws of the country they want to go to.
If you believe that you know people who are in the UK illegally, then you can report it by clicking here. Alternatively, you can call the Immigration Enforcement Hotline on 0300 123 7000.
You can also ring the Customs hotline by calling 0800 595 000.
If you believe that you know someone or a group of people who are involved in trafficking people into the UK, please report it here.
If you have just seen people jump out of a lorry and they are still in the area, please call us on 999 immediately.