ISIS has at least FIFTY jihadis working undercover as baggage handlers and cleaners at Brussels airport, police sensationally claim

The inside of the airport terminal was blown to pieces by the nail bomb blast. Reuters

AT least fifty ISIS supporters work as baggage handlers, cleaners and catering staff at Brussels airport, according to sensational new claims.

Airport Police made the stunning accusations in an open letter and threatened to strike over security lapses.

Deadly brothers Ibrahim and Khalid El Bakraoui were spotted on CCTV before the deadly blast. INTERPOL

They say warnings about more terrorist attacks are not being taken seriously.

The letter reads: “There are at least 50 supporters of the Islamic state who work at the airport. They have a security badge and have access to the cockpit of a plane.

“In the past, a number of people had their badges revoked because they had IS sympathies. But clearly not everyone, especially in store personnel, cleaning services and baggage where we find the most suspicious people.”

It says some staff members celebrated the Paris attacks in November.

Officers have also raised concerns about suspected terrorists who have been spotted scouting the airport.

The letter, as reported in the Daily Mail, adds: “Some people suspected of having fought in Syria came to the airport as ‘false tourists’.

“We reported their presence but we do not know if anything was done with that information.”

Brussels airport could open as soon as this weekend despite being blown up by suicide nail-bombers.

The building is still suffering bomb damage but could run at 20 per cent capacity.

Workers begin repair work on the bomb damaged terminal. Reuters

Ibrahim El Bakraoui (pictured centre alongside Najim Lachraoui, left, and the mysterious 'man in white', right) blew himself up at Brussels airport AP:Associated Press

Brussels airport could open as soon as this weekend after being damaged in the bomb attacks. Picture supplied by Xposure