Police refused to sleep in a migrant shelter cleared for them during Barack Obama's trip to Germany after they found the premises and beds covered in urine, blood, faeces and semen.

Photographs of the disgusting conditions in the rooms were posted on Facebook two days ago by the union for North Rhine-Westphalia Police.

The officers were asked to stay in the former migrant home as their own police barracks was accommodating security team members attached to world leaders' meetings with Obama.

Officers were shocked to find the showers inside the accommodation (pictured) stained brown and yellow

An unknown substance is seen on the sheets of one of the bunk beds at the former asylum seeker centre

A smear is visible on the edge of a mattress at the centre, which police eventually refused to sleep in

Police were asked to stay there instead of their normal barracks because it was full with security teams working the Obama visit to Hanover. Pictured are blood stains on a mattress

In a post on the police union's Facebook page, they described seeing cockroaches 'eating' leftover food

The carpet was also seen covered in vomit (left) and other substances (right) wet the floors next to beds

The images showed spots of blood were dotted on a mattress, while what appeared to be faeces was smeared on another, Junge Freiheit reported.

Wet patches also covered the floors of the bunk bed accommodation and a large patch of vomit was stuck to the carpet.

However, police refused to sleep in the filthy conditions, instead opting to kip in their vehicles while parked at a zoo - where they were yesterday seen being woken up by giraffes.

The post on the police union page described the accommodation conditions as 'catastrophic' and said cockroaches were seen eating leftover food.

Although it 'welcomed the exchange of housing units' during such events, it said organisers must ensure clean standards were met.

Around 250 officers slept in their vans at the Serengeti Park in Hodenhagen, northern Germany, before the meeting of the G5 group of nations in Hanover.

Serengeti Park has 1,500 animals roaming free in grounds designed to resemble their natural habitat.

For the giraffes, which are natives of Africa, it is a landscape of open grassland and patches of woodland.

Visitors usually move around the park in safari vehicles, with protective rails keeping the animals in view, but largely out of reach.