The attacks on Tuesday targeted three locations in Gaza, officials told Al Jazeera.
The Israeli military said it carried out the air attacks in response to a rocket fired towards Israel.
Hamas spokesman, Hazem Qasem, rejected Israel's claims.
"The airstrikes targeted Hamas positions in the centre of the Gaza Strip," Qasem told Al Jazeera.
"The occupation claims that a group from Gaza launched rockets at them, but there is no side in Gaza that has claimed responsibility.
"We are maintaining the period of calm and did not launch any rockets. It is not beneficial for the occupation to violate this period of calm."
The emergency director at the al-Shifa hospital in Gaza, Ayman al Sahbani, told Al Jazeera that three of the injured were discharged after undergoing treatment.
"The fourth person, a 26-year-old, is in serious condition. He has a fractured skull and is unconscious in the ICU," Sahbani said.
Israel holds Hamas responsible for all fire coming out of the Gaza Strip.
For the last decade, Hamas has been the de facto government of Gaza, while the Fatah-led Palestinian Authority has controlled the West Bank.
Israel and Hamas have fought three wars since the group took control of Gaza, most recently in 2014.
Lionel Messi and Cristiano Ronaldo are both incredibly successful soccer players, and they have each won a large number of trophies and awards throughout their careers.
Cristiano Ronaldo and Lionel Messi are both considered to be among the best soccer players in the world. Both players have had highly successful careers.
Al-Nassr FC is a professional football club based in Riyadh, Saudi Arabia. The club was founded in 1955 and has won several domestic and international titles.
Vivo sub-brand iQOO has launched the company’s latest 5G smartphone- iQOO Z1x 5G in China on July 9, 2020.
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Russian President Vladimir Putin says the Israeli military’s aerial operations in the Syrian airspace are in flagrant violation of the incumbent Damascus government’s sovereignty as tensions are simmering between Moscow and Tel Aviv over the downing of the Russian Ilyushin Il-20 reconnaissance aircraft in the western Syrian province of Latakia.
The permanent residency card will grant them the same access to education and healthcare in government institutions as Qatari nationals.
According to the latest leak, Samsung Galaxy A91 may launch in India at the end of this year.
Xiaomi India has just unveiled it's latest flagship killer- Xiaomi Mi 10 5G smartphone in India.
Honor has just launched the Honor 9A smartphone for the global markets and the price starts from €149.90 (US$ 169.6 / Rs. 12,810). Read on to know more.