Prime Minister Tony Blair has been questioned by police about a case involving the government.
The police are looking into claims that some people who lent money to Mr Blair's Labour Party were put forward to become Lords, which may be illegal.
It's a big honour to become a Lord - also called a peerage - but you can't become one in return for money.
The police spoke to Mr Blair as a witness. It's not suggested they think he has done anything wrong.
Lots of people lend money to political parties and there is nothing wrong with them doing it, but it is wrong if they are trying to get something in return.
As prime minister Mr Blair is allowed to pick people he thinks should be made Lords.
He had to explain to the police the reasons why he chose each person he thought should be given a peerage.
Political experts say it is very unusual for a prime minister to be questioned in a criminal investigation, but also said the interview has been expected for a while.