Do we need a new system? A horrifying attack in London last week has started a debate about whether it is too easy for criminals to gain asylum in Britain.
Chemical attack sparks anger over UK asylum
Escaped: Police are still looking for the suspect, who ran away after the attack. Glossary
Afghanistan - A mountainous Asian country, slightly larger than France, whose neighbours include Pakistan, Iran and China.
Asylum - When a state agrees to shelter somebody who is fleeing dangerous circumstances. The right to asylum is protected in international law by the 1951 Refugee Convention.
Convicted - Found guilty of a crime in a court.
Asylum seekers - People who have left their countries due to danger and are seeking refuge elsewhere.
Legal - Something that is legal is allowed by the law.
UN - United Nations. An intergovernmental organisation based in New York that aims to maintain international peace and security.
Applications - An official request for something. Also, 'applications', or 'programmes' are processes that work with stored information to produce the desired result. To watch a film on a computer, for example, you need an application to turn the raw data (stored as 1s and 0s) into a picture on your screen.