TERROR cops have arrested two people after dozens of suspicious packages were sent to hospitals across the UK.

Reports claim some of the packages, which were also sent to blood testing labs, contained "unlabelled fluids".

The packages were sent by a group calling itself The Cyrus Project and asked medics to test the samples, Huffington Post reports.

Counter Terrorism officers yesterday arrested a 29-year-old man from Brent and a 37-year-old man from Harrow on suspicion of Malicious Communications Act offences.

A warning has now been issued to health service chiefs by Chief Medical Officer, Professor Dame Sally Davies.

It says: "An organisation identifying itself as ‘The Cyrus Project’ has sent unsolicited packages, with accompanying literature requesting testing on the enclosed sample, to a number of health related organisations over the last 24 hours."

Tests carried out on the packages confirmed the substances were non-hazardous but staff are being urged to wear rubber gloves if they come into contact with one.

The warning also confirmed counter-terror police are investigating and told medics "forensic testing is underway".

The Milton Keynes University Hospital research and development department is one of the units that received a “brown paper bag package containing a sample of unlabelled fluid”.

A letter circulated at the hospital revealed "similar samples" have been sent to 25 other trusts.

A Metropolitan Police spokesperson said: "We can confirm that we have received a number of reports relating to suspicious packages being received at hospitals in London.

“Specialist officers have attended the hospitals and are assessing the packages. None of the packages assessed so far have been found to contain anything hazardous.

“Police enquiries are ongoing.”