Thankfully school was cancelled.

Via Times Of Israel:

A rocket fired from Gaza has hit a school in Ashkelon. This is the second time on Monday that a school in the city was hit by a Hamas missile. No injuries were reported, though the school building was damaged. [...]

On the sixth day of Operation Pillar of Defense, Israel upped the frequency of its airstrikes at the Gaza Strip, targeting smuggling tunnels, rocket launching squads, weapons and ammunition caches (including one located under Gaza City’s main soccer stadium), and terror groups’ field commanders. The death toll in Gaza stands at 84, roughly two thirds of which are combatants.

Meanwhile, terror organizations in Gaza continue to launch rockets on southern Israel, hitting an Ashkelon school, which fortunately was empty of students and staff. Iron Dome intercepted 35 rockets in the past 24 hours. Since the beginning of the operation, on Wednesday, 540 rockets were fired on Israel, most of them falling harmlessly in unpopulated areas.

Update:

Rocket that hit a school in Ashkelon caves the roof in on a classroom on the top floor. Footage from Channel 2 shows the extent of the damage. The classroom is wrecked, with rubble and dust strewn across the ruined desks and chairs. The two or three-foot diameter hole in the crumbled ceiling exposes the jagged rebar of the reinforced concrete.

No injuries are reported. School in Ashkelon has been canceled for several days.