Strikes in multiple neighborhoods across northern Gaza today have killed 42 people according to Gaza's Civil Defense. Videos from the immediate aftermath of the strike show an entire building leveled, children covered in dust.

A bombing of Al-Shati camp killed 24 people, a bombing in Al-Tufaah killed 18 people -- the number of casualties is likely to increase -- and a bombing in Al-Zaytoun killed 7 people, according to Civil Defense.

Fifty others were injured in the attacks, according to the Hamas media office.

Several others are still trapped under the rubble.

The Israel Defense Forces told ABC News they struck two Hamas military infrastructure sites in Gaza City.

The U.S. military pier in Gaza will be taken offline again on Friday and moved to the Israeli port of Ashdod due to high seas, according to a U.S. official.

This is a precautionary move to protect the pier from breaking due to rough waves, the official said.

This is the third time the pier has had to be moved to Ashdod because of weather. The pier has been operational only about half of the time since it opened in mid-May.

“I don't have a date of when the pier would be reinstalled,” Defense Department deputy spokesperson Sabrina Singh told reporters Friday, noting that Centcom will assess the sea conditions over the weekend.

As the pier was moved away Friday, two U.S. officials told ABC News that officials are considering not re-installing the pier until the humanitarian aid that it brought to Gaza gets distributed. More than 19 million pounds of aid has been delivered to Gaza via the pier but it’s now piling up at the staging point at the edge of the pier, Singh said.

Inspectors General at the Pentagon and the U.S. Agency for International Development announced Thursday that they’re launching reviews of the mission to deliver humanitarian aid into Gaza via the military's temporary pier system.

-ABC News’ Anne Flaherty and Luis Martinez