What can get in and out of Gaza?
As we've been reporting, the US, Israel, the UN and Egypt are holding discussions about how to allow some aid into Gaza, and some residents out.
But at the moment, no crossings into Gaza are functioning.
All the crossings into Israel have been closed since Hamas launched its deadly attack on Israel on Saturday.
Until yesterday, the Rafah crossing between Gaza and Egypt was operating.
On Sunday, it was open for goods and about 200 trucks of food, fuel and construction materials were allowed in,
according to the UN.
However, even when the crossing is operating, only a few hundred people are allowed to cross each day, and this is limited to those who have applied to have their names on a list.
On Monday, the UN says,
about 800 people left Gaza and about 500 entered, but the crossing was closed for the movement of goods.
Despite the limited numbers able to use the crossing, on Tuesday morning, an Israeli military spokesman said he was "aware that the Rafah crossing was still open" and "anyone who can get out, I would advise them to get out".
And then the crossing area was hit by air strikes, officials in Gaza and Egyptian sources told Reuters news agency. Trucks were pictured apparently heading back into Egypt.
The crossing has been closed since then.