Gaza forces fire rockets to mark Israel conflict anniversary
The demonstrations were scheduled to last several hours and involve about 10 groups in the Israeli-blockaded Palestinian enclave, said a spokesman for the Al-Quds Brigade forces, the armed wing of Islamic Jihad.
The goal of the exercise, the first of its kind, is to "strengthen the skills of combatants" and demonstrate the "unity" of armed groups in Gaza, added the spokesman, whose face was almost entirely covered by a traditional headscarf.
The drills also come days after Hamas accused Israel of launching strikes that damaged a children's hospital.
It ended with a ceasefire in January 2009, after 1,440 Palestinians and 13 Israelis were killed.
Hamas and Israel fought two further conflicts, in 2012 and 2014.
A fragile truce has broadly held in recent months, despite rocket fire from Gaza which is generally followed by retaliatory Israeli air strikes.
Poverty rates in Gaza, which hovered around 50 percent before the coronavirus pandemic, are thought to have increased since Hamas imposed lockdown measures to limit transmission.