Amess is said to have been stabbed several times in connection with a meeting with voters in Leigh-on-Sea in Essex.
He belongs to the Conservative Party and has his constituency in Southend West in Essex.
Medical staff are on site at the church where the political meeting took place.
- He was stabbed several times, says municipal councilor John Lamb to Reuters.
- We do not know how serious it is, but it does not look good.
A 25-year-old man has been arrested after the knife attack, according to the police in Essex, who state that they are not looking for more perpetrators.