At least 25 people have been killed in the latest suicide bombings to strike Iraq.

In Samarra, about 70 miles north of Baghdad, at least 11 Shia pilgrims were killed when a bomb blew up an ambulance in the car park of a religious shrine on Sunday.

Ali al-Hamdani, spokesman for the Salahuddin province, said the bomber walked into the crowd of people before detonating the vehicle and blowing himself up.

Five female students are believed to be among the dead and more than 100 people have been injured.

Meanwhile, in Tikrit in the northwest, annother ambulance was detonated at the entrance to the city during the morning rush hour, killing a further 13 people.

Isis has claimed responsibility for the attacks in retaliation for their loss of territory in the north of the country.

In pictures: Baghdad bombing Show all 20 1 /20 In pictures: Baghdad bombing In pictures: Baghdad bombing Mourners react during a funeral of a victim who was killed in a suicide car bomb in the Karrada shopping area in Baghdad REUTERS In pictures: Baghdad bombing Mourners react during a funeral of a victim who was killed in a suicide car bomb in the Karrada shopping area in Baghdad REUTERS In pictures: Baghdad bombing Mourners carry the coffin of their relative, who was killed in a suicide vehicle bomb in the Karrada shopping area in Baghdad REUTERS In pictures: Baghdad bombing Iraqis react as they visit the aftermath of a massive bombing in Baghdad AFP/Getty Images In pictures: Baghdad bombing The mother (2nd L) of 16-year-old Iraqi Nabil Abdul Karim, who died in a massive bombing in Baghdad's Karrada neighbourhood as he went to celebrate his birthday, reacts as she visits the aftermath of the attack AFP/Getty Images In pictures: Baghdad bombing An Iraqi woman cries as she visits the aftermath of a massive bombing in Baghdad AFP/Getty Images In pictures: Baghdad bombing Iraqis react as they visit the aftermath of a massive bombing in Baghdad AFP/Getty Images In pictures: Baghdad bombing Iraqis gather at the site of a suicide car bombing in Baghdad's central Karrada district AFP/Getty Images In pictures: Baghdad bombing People light candles at the scene of a massive car bomb attack in Karrada, a busy shopping district where people were shopping for the upcoming Eid al-Fitr holiday, in the center of Baghdad AP In pictures: Baghdad bombing People light candles at the scene of a massive car bomb attack in Karrada AP In pictures: Baghdad bombing People light candles at the scene of a massive car bomb attack in Karrada AP In pictures: Baghdad bombing Iraqi women stand at a site barricaded with a security red tape in Baghdad AFP/Getty Images In pictures: Baghdad bombing Iraqis evacuate a body from the site of a suicide car bombing in Baghdad AFP/Getty Images In pictures: Baghdad bombing Firemen inspect the site of a suicide car bomb in the Karrada shopping area REUTERS In pictures: Baghdad bombing Iraqi firefighters spray water on a burning building at the site of a suicide car bombing claimed by the Islamic State group AFP/Getty Images In pictures: Baghdad bombing People gather at the site of a suicide car bomb in the Karrada shopping area REUTERS In pictures: Baghdad bombing Iraqis evacuate a body from the site of a suicide car bombing in Baghdad AFP/Getty Images In pictures: Baghdad bombing Iraqi women walk past a damaged building at the site of the attack AFP/Getty Images In pictures: Baghdad bombing Iraqis removed a burnt car from the site of the attack AFP/Getty Images In pictures: Baghdad bombing Iraqi firefighters extinguish a fire as civilians gather after a car bomb at a commercial area in Karrada AP

The jihadist group identified two of the bombers as "Al-Moslawi" – a nom de guerre that would indicate they were from Mosul, though it could be a propaganda attempt to link militants from other areas with the ongoing battle for Iraq's second city.

The Iraqi Army and Kurdish fighters are currently locked in a battle with Isis to regain control of Mosul – the jihadi group's last major stronghold in the country.

The World Health Organisation condemned the use of ambulances in the bombings, saying this form of attack made it harder for emergency services to help people in need.

The man walked into the car park of a religious shrine in Samarra and detonated both the ambulance and himself (REUTERS)

In a statement to The Independent, a spokesman said: "The reported use of medical vehicles as weapons threatens the ability to deliver health care and urgent medical services.

"When ambulances are suspected as potential security threats, their freedom of movement to care for the sick and injured is at risk of life-threatening delays. Such delays will leave vulnerable people with even less access to life-saving medical care.

"WHO is increasingly concerned by the continuous threats to health workers, facilities and transport.

"WHO is working together with national health authorities and partners to protect patients, health workers, health infrastructure and supplies from violence and thus minimise disruptions to desperately needed health care."