Palestine, Oct. 2 -- This morning, an attack carried out by Israeli forces in Gaza killed Doctors Without Borders/Medecins Sans Frontieres (MSF) occupational therapist Omar Hayek and seriously injured four other people.

The attack took place on a street where our teams were waiting to take a bus to the MSF field hospital in Deir Al-Balah. All staff were wearing MSF vests, clearly identifying themselves as medical humanitarian workers.

We express deep sorrow and outrage over the killing, which occurred less than two weeks after another MSF colleague, Hussein Alnajjar, was killed by Israeli forces, also in Deir Al-Balah.

Our thoughts are with Omar's family and colleagues at this tragic time. Omar was 42 years old and is the 14th MSF coll...