WASHINGTON — A ceasefire deal was reached Wednesday to end 15 months of fighting in the Gaza Strip, according to President Joe Biden, Qatar’s prime minister and Hamas officials.

The hard-won agreement will also free dozens of hostages held in Gaza, as well as Palestinians in Israeli jails, bringing the first real break in violence since a weeklong truce expired Dec. 1, 2023.

The deal will take effect Sunday, according to Qatar’s prime minister and foreign minister, Sheikh Mohammed bin…