The sources said the twelve Palestinians were injured when an Israeli missile struck a home in al-Qarara town, east of Khan Younis, in the southern part of the Gaza Strip.
They suffered mild-to-moderate injuries, and were moved to the Nasser Hospital in Khan Younis.
In addition, Israeli war jets fired missiles into an agricultural area in al-Waha area, west of Beit Lahia, in the northern part of the Gaza Strip.
Several missiles were also fired into the Safeena area, west of Gaza city, causing damage but no injuries.
Israeli Navy boats also fired many shells into the coast of Rafah, causing damage to several Palestinian fishing boats.
Late on Monday at night, Israeli war jets fired missiles into farmlands close to the Abraj an-Nada residential towers, in the northern part of the Gaza Strip. Also in northern Gaza, missiles were fired into farmlands in the Sudaniyya area.
Israeli missiles also targeted areas close to the Gaza International Airport that was repeatedly destroyed by Israeli army bulldozers, and repeatedly bombarded, during ongoing Israeli wars and aggression on the coastal region.