Two brothers behind the Brussels bombing attacks

Two of the suicide bombers who carried out attacks in Brussels on Tuesday have been named as brothers Khalid and Brahim el-Bakraoui, Belgian nationals.

The federal prosecutor said Brahim was part of the attack at Zaventem airport that killed 11 people. Khalid struck at Maelbeek metro, where 20 people died.

Two other attackers at the airport have not yet been identified. One of them died, another is on the run.

So-called Islamic State (IS) has said it was behind the attacks.

Belgium is observing three days of national mourning. The nation held a minute's silence at midday (11:00 GMT) on Wednesday. Belgium's king and queen visited the airport and met some of the 260 injured in hospital.

Federal Prosecutor Frederic Van Leeuw said Brahim el-Bakraoui had been identified as the middle of three men in a CCTV image of the suspects of the airport attack.

The man on the left is believed to have died at the airport. The man on the right, wearing the hat, is thought to have fled the scene.

Mr Van Leeuw told reporters that a taxi driver said he had picked up the three men from an address in the Schaerbeek area of Brussels. This apartment was raided later on Tuesday and bomb-making materials, including 15 kilos (33 pounds) of high explosive, were found.

A note from Brahim el-Bakraoui was also found, in which he said people were looking for him everywhere and that if he gave himself up he would end up in a cell, the prosecutor related.

Mr van Leeuw said the two brothers were known to police and had criminal records. They were identified by DNA records.

The RTBF broadcaster, quoting a police source, said that Khalid el-Bakraoui, 27, had used a false name to rent the flat in the Forest area of the Belgian capital where police killed a gunman in a shootout last week.

It was during that raid that police found a fingerprint of Salah Abdeslam, the main suspect in the Paris terror attacks of 13 November.

He was arrested in a raid in Brussels last Friday and is due to appear before a pre-trial court on Wednesday.