Israel declares siege of Gaza as Hamas threatens to start killing hostages

Hamas says Israeli strikes have killed some captives and it will kill another if bombing without warning continues

• Israel and Hamas at war - live updates

Israel has declared a complete siege" of Gaza, cutting off water, food and power supplies, as Hamas militants threatened to start killing Israeli civilian hostages if the bombing of civilian areas in the enclave continued without prior warning.

Palestinian militants abducted more than 100 people during a surprise multi-front attack in which they killed more than 700 - making Saturday the deadliest day in Israel's history. Israeli media said on Monday the death toll had climbed to 900.