UNICEF on Friday appealed for a lasting ceasefire to be implemented in Gaza, describing inaction as "an approval of the killing of children" after a week-old truce between Israel and Hamas collapsed.
"A lasting ceasefire must be implemented," James Elder, spokesperon for UNICEF, told reporters via video link from Gaza.
"Inaction at its core is an approval of the killing of children."
Barely two hours after the truce expired, Gaza health officials reported that 35 people had already been killed and dozens wounded in air strikes that hit at least eight homes.
Medics and witnesses said the bombing was most intensive in Khan Younis and Rafah in the southern Gaza Strip, and also targeted houses in central and northern areas.