A medical shipment has landed in the beleaguered Liberian capital of Monrovia for treating the wounded and staunching the spread of cholera, the World Health Organization said Thursday.

The U.N. health agency airlifted 30,000 surgical kits by helicopter from Sierra Leone to Monrovia on Wednesday. The load included cholera drugs for 300 people.

More cholera treatment supplies should arrive in the city in the next few days, the agency said.

As a fragile truce held for the sixth day, aid agencies estimated that at least 1,500 people have been wounded in the fighting.