IG Ibraham El Bakraoui (l), Najim Laachraoui and Khalid El Bakraoui carried out the attacks

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Turkey's President Recep Tayyip Erdogan revealed Ibrahim El Bakraoui, one of the brothers responsible for the attacks on Brussels Airport yesterday, was sent to the Netherlands in June last year. He said Belgium had ignored Turkey's warnings the Brussels attacker was a jihadi militant and was later released by Belgian authorities because they said "no links with terrorism" were found.

At least 31 people were killed and 270 injured in Tuesday's terror attacks on Brussels Airport and the Maelbeek Metro station in the Belgian capital. Ibrahim El Bakraoui left a will and statement on a laptop found abandoned in a bin near the Brussels district of Schaerbeek where a police raid on a flat found an Islamic State (ISIS) flag and other bomb-making materials.

IG The three suspects: Najim Laachraoui (l), Ibrahim El Bakraoui (m) and an unknown suspect

Statements from Ibrahim on the device said he "was being investigated, no longer knew what to do, was being looked for everywhere, was no longer safe" and that he risked "ending up next to [Salah Abdeslam] in a cell". Detectives found 15kg of explosives, 150 litres of acetone, 30 litres of oxygenated water, detonators and a suitcase filled with nails. Belgium's security services have been widely criticised following yesterday's twin terror attacks which were claimed by depraved Islamic State (ISIS).

The attacks came just four days after Belgian police arrested Salah Abdeslam, the main surviving suspect in November's attacks on Paris, raising questions over the capabilities of the police in the de facto European Union capital. One US Government official said the deadly attacks showed Belgian authorities still "have not upped their game". And Israeli intelligence minister Israel Katz ridiculed Belgium's failure to stop Tuesday's attack during a radio interview on Wednesday. He said: "If in Belgium they continue eating chocolate and enjoying life, and continue to appear as great democrats and liberals, they won't be aware that some Muslims in their country are organising terror."

Getty Brussels was in mourning today following the terror attacks on Tuesday

US Government sources said, while the United States and Belgium had believed another attack after Paris was higly likely, they did not have hard intelligence about where or when such an attack would occur. But there was always going to be problems for Belgium's security authorities because the country is home to the highest per capita number of fighters to Syria of any European nation. The crowded Brussels borough of Molenbeek has also been described as a "Jihadist air base" because of the number of militant suspects believed to be living there.

Worldwide tributes to Brussels victims Wed, March 23, 2016 Tributes for the Brussels attack victims began pouring in as soon as news of the devastating attack spread globally Play slideshow PA/Twitter 1 of 52 Tribute poor in for the Brussels attacks

To follow a single suspect around 24 hours a day without being detected, security agencies need crews of as many as 36 officers, US and European officials estimate, meaning even well-staffed agencies such as Britain's MI5 can only closely follow a limited number of suspects at any particular time. According to Alain Winants, head of the Belgian intelligence service from 2006 until 2014, Belgium was one of the last places in Europe to obtain modern techniques to gather information, such as telephone taps.

On one occasion, police had to deny they let Abdeslam slip due to a law banning house raids at night. Talking about President Erdogan's revelation over Ibrahim El Bakraoui, Mike Hookem, a UKIP MEP, said: "Belgian security services were clearly involved in a massive failure which ended up in the deaths of innocent people. "Our security services in the UK are excellent but the terrorists only need to 'get lucky' once, as the saying goes: we need to get it right every time. "It is self evident we canot rely on the checks of other countries and have to have strict border controls."

Caters 270 people were injured in the attacks

Nearly 6,000 firearms are seized every year in Belgium, more than in all of France, police data shows, often sold by Balkan crime networks to home-grown Belgian jihadists. Questions have also been raised over why authorities have not yet caught Najim Laachraoui, thought to be the bombmaker responsible for the Paris massacre and the third suspect in the Brussels Airport attack. Brussels’ prosecutor said two people had been arrested in separate locations over the attacks, one who was released without charge. The other is still being quizzed

Fly A flat searched in Brussels yesterday had an ISIS flag, a bomb and chemicals in it