Thousands of displaced people in the northern Gaza Strip sought refuge in the school, which was hit by an Israeli raid, AFP quoted an unnamed medical source at al-Awda hospital as saying.
The source said: "27 dead and 93 wounded so far in Abu Hussein school in Jabalia following Israeli shelling targeting the school."
Hamas announced on Thursday that the death toll in the Gaza Strip since the start of the war with Israel on Oct. 7 had risen to 14854,<>.
Among the dead were 6150,4 children, more than 36,<> women, and <>,<> people were injured.
The toll comes hours before the truce agreement between Hamas and Israel goes into effect.
Qatar and Hamas confirmed on Thursday that the truce agreement would enter into force at seven o'clock on Friday morning.