Brazilian President Luiz Inacio Lula da Silva has said Israel's behavior in the Gaza Strip is beyond explanation.

"Israel's behavior has no explanation," he said after a meeting with Egyptian President Abdel Fattah al-Sisi in Cairo on Thursday.

"With the pretext of fighting Hamas, it (Israel) is killing women and children," Lula said, Press TV reported.

The Israeli regime's response was "disproportional and indiscriminate" and unacceptable, the Brazilian head of state noted.

"The killing must be stopped," he said, calling for an immediate ceasefire to allow humanitarian aid into Gaza.

Elsewhere in his remarks, Lula criticized the United Nations over its inability to resolve the situation in Gaza, including through the failure of the world body's Security Council (UNSC) to pass a resolution calling for cessation of the Israeli aggression.