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.
Debate - A discussion about a subject in which people explain or argue their different points of view.
Asylum seekers - People who have left their countries due to danger and are seeking refuge elsewhere.
Apply - A formal request to do something — for example, join a certain university.
Legal - Something that is legal is allowed by the law.