The Gaza rocket exploded inside Israel without causing injuries or damage yesterday night as Independence Day celebrations for the country's 67th anniversary were winding down.
The Israeli military said it was the first rocket fired at Israel from Gaza this year.
Soon afterward Hamas officials in Gaza said Israeli forces fired two shells at a base its militants use for training. Gaza health official Ashraf al-Kidra said there were no injuries.
The military said the last time a rocket was fired from Gaza at Israel was in December.
Sirens wailed warning of incoming rockets in Sderot and other Israel communities bordering Gaza yesterday evening.
Residents said they heard sounds of explosions and soldiers searched for rocket fragments into the night.