At least two rockets fired from the Gaza Strip shorty before a 72-hour ceasefire was due to end struck Israel, police said.
Spokesman Micky Rosenfeld said the rockets landed in open areas causing no damage or casualties.
The attacks occurred as Palestinians announced an agreement to extend the truce for another five days.
There was no immediate comment about the deal from Israel.
There have been two days of quiet in Gaza. No rockets or missiles, no more destroyed houses, no more ambulance sirens screaming.
A three-year-old girl has been rescued from Gaza and brought to London for life-saving heart surgery.
A small team of NHS doctors and surgeons is travel to Gaza to set up facilities and establish how best to use specialists and equipment.