Volunteering for Somali drought aid (Nairobi)

Hello

I am looking for a charity that wants volunteers to help with the aid relief in Northern Kenya.

My wife is really keen to be involved with volunteering up in North Kenya/ Somali border at the refugee camps.

Does anyone know of any charities that are desperate for volunteers. My wife is currently back n London seeing the images on the news and wants to get involved, she will be back in Kenya mid august.

Thanks for Reading

Andy