Israel has carried out fresh attacks on Gaza and militants have launched more rockets into Israel as a hunt continues for a missing Israeli soldier.

Palestinian officials said 47 people died overnight in Israeli strikes, most of them in Rafah, where the soldier, Hadar Goldin, went missing.

A series of rocket attacks into Israel were reported on Saturday morning.

At least 1,600 Palestinians, mostly civilians, and 63 Israelis, mainly soldiers, have died in the conflict.

A Thai worker was also killed in Israel.

A 72-hour ceasefire had been agreed, starting from Friday morning, but collapsed hours later.

Hamas accused Israel of breaking the ceasefire but the Israel Defense Forces (IDF) said it had been forced to respond to militant rocket fire.

US President Barack Obama on Friday described the crisis as "heartbreaking" and said he would work to secure another truce.

Palestinian officials said that there had been a series of Israeli air strikes around Rafah since midnight, killing at least 35 people.

They said that across Gaza overnight, 40 homes, three mosques and a university were hit.

Israeli media said that after a relatively quiet night, a number of rockets had been fired on Saturday morning, including at Tel Aviv.

The Qassam Brigades, the armed wing of Hamas, which controls Gaza, said it had fired three rockets at Tel Aviv.

At least two were reportedly shot down by the Iron Dome missile defence system.

Egypt's state-run news agency Mena reported on Saturday that Egypt's Rafah border crossing with Gaza had been reopened for humanitarian reasons, to help the casualties.

The Qassam Brigades meanwhile said it had no information about the fate of 2nd Lt Hadar Goldin, 23.

Israel said he may have been captured during an ambush in which two other soldiers were killed.

In a statement early on Saturday, the Qassam Brigades said it lost contact with a group of fighters in the area where the soldier went missing, saying: "We believe they were all killed in the [Israeli] bombardment.

"Assuming that they managed to seize the soldier during combat, we assess that he was also killed in the incident."

Mr Obama called for the release of Lt Goldin.

Mr Obama said: "If [Hamas] are serious about trying to trying to resolve this situation, that soldier needs to be unconditionally released, as soon as possible."