Reports did not speak of any immediate injuries in the strikes, the first in over ten days.
A spokesman for Hamas said it didn't fire the rockets but had erected the sign.
The Iron Dome aerial defense system intercepted two rockets launched from the Gaza Strip, the Israeli Defense Forces (IDF) posted on Twitter.
Witnesses said Israeli tanks shelled a position controlled by Hamas in the east of Gaza city. Both of the intercepts were made above Kibbutz Alumim, close to the Gaza border. However, a building in Sha'ar Hanegev sustained some damage when a third rocket landed nearby. While in Kfar Azza, residents and guests were marking the birthday of deceased IDF soldier Oron Shaul, z'l, whose remains are still being held hostage by Gaza's ruling Hamas terrorists along with those of IDF officer Hadar Goldin, z'l.
Clashes also erupted in the West Bank as Palestinians marked another "day of rage" following US President Donald Trump's controversial December 6 recognition of Jerusalem as Israel's capital.
The Israeli military used tear gas and gunfire to break up protests on Friday.
The al-Mezan Center for Human Rights reported in that between January and May of 2017, Israel had seized five fishing boats, detained 14 Palestinian fishermen, shot and injured four, while two fishermen were killed.
At least 500 people have been arrested, including Fatah leaders in Jerusalem.