Hamas officials said an explosion went off early Thursday near a group of Hamas policemen patrolling in Gaza City , wounding three, including one critically.
Hamas blamed the rival Fatah movement for the attack, and said it has rounded up several suspects.
The explosion came at a time of rising tensions between the bitter rivals.
Earlier this week, Hamas blamed Fatah for what it said was a failed attack on a Hamas security compound. In the incident, three Fatah activists and a bystander were killed when a blast went off in a car, possibly because of mishandled explosives. A day later, Hamas raided a four-story Fatah office building.
Hamas took control of Gaza by force in June, defeating the security forces loyal to Fatah and moderate Palestinian President Mahmoud Abbas.
The behavior of the Russian inspector satellite, which was launched in the autumn of 2017, puzzles military officials in the United States
When the bill was submitted to Congress on August 2, the reason for imposing the new sanctions on Russia was based on Russia's alleged interference in the US presidential election in 2016, but then something clicked