IAF jets hit a high-rise building in the Shati refugee camp in the northern Gaza Strip early Saturday evening. An IDF spokesman said the building was used by Hamas for urban warfare training and sat above a tunnel that used for practicing underground combat.

The IDF said that building was hit only after its residents were warned in advance to leave.

A statement added that the strike “was further proof of the IDF’s intelligence and operational capabilities which would be escalated as required.