Red Cross chief Jakob Kellenberger fears that UN-Arab envoy Kofi Annan's peace plan for Syria is "in danger," according to an interview in the Swiss weekly Der Sonntag.

"I place great hope in the six-point plan of Kofi Annan, which includes the UN mission tasked with monitoring the ceasefire," Kellenberger told the paper. "Unfortunately, I am also very aware that the plan is in danger."

Continued violence has shattered a ceasefire that took effect on April 12 in a conflict that has claimed more than 11,100 lives across the country, mostly civilians, according to the Syrian Observatory for Human Rights.

Since the start of the government crackdown on protests in March last year, the head of the International Committee of the Red Cross has visited Syria three times, and he met with President Bashar al-Assad last September.

His third visit was earlier this month aimed at bolstering the ICRC's capacity in the country.

The ICRC, working with the Syrian Red Crescent, has distributed food and other humanitarian aid to some 300,000 people since the crisis erupted, Kellenberger said.