There has been no immediate comment from Israel, which typically does not comment on specific reports of strikes in Syria.
Prime Minister Benjamin Netanyahu said three policemen had been in the vehicle and were killed in Sunday's attack.
Asked when a ceasefire deal would start if a deal is reached, Biden said: "That remains to be seen."
Late last month, Netanyahu visited the U.S. and met President Joe Biden, Vice President and Democratic presidential candidate Kamala Harris and Republican former President Trump.
This round of negotiations opened on Thursday, and the talks would resume on Friday for a second day, Qatari and U.S. officials said.
The Hamas-run media office said in a statement that the strikes hit when people sheltering at the school were performing dawn prayers, leading to many casualties.
Gaza's Civil Emergency Service said dozens were wounded in addition to the fatalities in the schools of Hassan Salama and Al-Nasser, which housed Palestinian displaced families
Prior to Israel's offensive in Gaza, NATO member Turkey had been working to mend its long-strained ties with Israel.
He said the IEA administration considered it an Islamic and humanitarian obligation to defend Hamas and condemn the atrocities perpetrated by Israel.
"We must be very strong so that Israel can't do these ridiculous things to Palestine. Just like we entered Karabakh, just like we entered Libya, we...
"In this time of war and uncertainty it's important that Israel's enemies know that America and Israel stand together today, tomorrow and always," Netanyahu said.
Police said the body of a man was found in an apartment close to the explosion and said the circumstances were being investigated.
Biden said that he had advised the Prime Minister of Israel not to occupy Gaza and make the mistake the US made in Afghanistan.
A dozen U.S. administration officials have quit, citing opposition to Biden's Gaza policy. Rights advocates also note a rise in antisemitism and Islamophobia in the U.S....
The comments signalled no change in the regional policies of the incoming government under the relatively moderate Pezeshkian who defeated his hardline rival in last week’s...
Mahmoud Basal, spokesman of the Gaza Civil Emergency Service, said in a statement that the number of dead could rise because many of the wounded were...
He also said Israel will act with full force against Iran-backed Hezbollah if it does not stop firing at Israel from Lebanon and move away from...