More than 1,000 Palestinians have been killed during Israel's 19-day war in Gaza, Palestinian medical officials have said, as clashes continue throughout the Strip.

Civilians make up the majority of casualities with children accounting for a third of the dead, aid agencies and Palestinian medics said.

At least 4,630 people have been injured, Hasanein Myawaya, the head of Palestinian emergency services, said.

Ayman Mohyeldin, Al Jazeera's correspondent in Gaza, said while fewer Palestinians had been killed on Wednesday than during previous days, the situation for Gazans remained one of "complete fear and terror".

"For those who venture out [for food]... they know that anytime they leave their house it could be the last time.

"More than 80,000 Palestinians have now fled their homes because of the fighting around them ... there is a sense of overcrowding ... UN schools have taken in 35,000 refugees.