Gaza's civil defence agency said Israeli air strikes on Sunday killed more than 30 Palestinians, including children at a water distribution point, as talks for a ceasefire between Israel and Hamas stalled.

Hamas and Israel on Saturday accused the other of blocking attempts to strike a Gaza ceasefire agreement, nearly a week into indirect talks between the two sides to halt 21 months of bitter fighting in the Palestinian territory.

As Israel and Hamas move closer to a ceasefire agreement, Israel says it wants to maintain troops in a southern corridor of the Gaza Strip — a condition that could derail the talks.