(CNN)The Israeli military and Palestinian militants in Gaza exchanged fire on Sunday, hours after a graphic video showing an Israeli army bulldozer scraping the body of a dead man off the ground went viral.
Israel and Palestinian militants exchange fire as graphic video of Israeli bulldozer carrying a body goes viral
Militants fired more than 20 rockets at Israel by early Sunday evening, according to the Israeli army, making it the largest single assault by militants on Israel in several months.
The army said its Iron Dome aerial defense system intercepted more than half of the launches, with many others landing in open areas. There are no reports of any Israeli injuries from the rockets.
Israel said it launched a series of strikes on targets belonging to Islamic Jihad, the smaller of the two main militant groups in Gaza. Israeli army spokesman Lt. Col. Jonathan Conricus told CNN it was the army's assessment that Islamic Jihad was responsible for the rocket fire.
Islamic Jihad took responsibility in a statement on its official website, saying its military wing, Saraya al-Quds, is responsible for the shelling. It promised to retaliate against any future "aggression."
Among the strikes, Israel says it succeeded in hitting a group of Islamic Jihad operatives preparing to launch a fresh barrage of rockets.
The Palestinian Ministry of Health said four people were being treated in Gaza's Shifa hospital for injuries, though it was not clear whether they were involved in the rocket attacks.
The escalation began Sunday morning when the Israeli army says it spotted two men trying to lay an explosive device close to the fence that separates Gaza from Israel. The army -- which released a video it said showed the two men carrying out their operation -- opened fire, killing one of them.
The dead man was identified as 27-year-old Mohammed Al-Naim. The Quds Brigade, the armed wing of Islamic Jihad, said he was one of their fighters.
Gaza sources tell CNN the other man is being treated in a Gaza hospital for severe wounds.
It was the second time in several days that members of Islamic Jihad tried to place an explosive device close to the fence, according to the Israeli army.
As the dead man lay on the ground, a local journalist captured the scene on video, which was subsequently shared widely on social media.
In the video, a group of four men is seen moving tow