former diplomat and advisor to the former german chanceler ohl. doctors without borders, they accused the saudi-led coalition that are fighting rebels in the country of carrying out discriminant bombings. the aid group says it's lost confidence in the ability to provept fatal attacks. 19 people were killed on an air strike in a hospital hospital in a rebel-held northern province. hundreds of aid workers have signed a petition calling for greater protection in conflict zones. it's been launched to coincide with the u.n. world's humanitarian day. they're calling for the united nations to end a culture of silence and dishonesty that allows relief workers to be targeted with impunity. reporter: one humanity is the theme of the motto to recognize aid workers. they hope it reflects the need of global solidarity to deliver hope where it's needed most. the day aims to pay tribute to those doing dangerous work with n.g.o.'s. officials warn even though they can mobilize almost immediately, funds are lacking to meet the huge demands for aid. >> we have the c