Three buses have exploded in central Israel in what Israeli police say is a "suspected terror attack".
Devices in two other buses failed to explode, they said, adding that "large police forces are at the scenes, searching for suspects".
The series of explosions on the parked buses rattled central Israel on Thursday on a day when Israel was already grieving after Hamas returned the bodies of four hostages from Gaza as part of a ceasefire deal.
The bus explosions were reminiscent of bombings during the Palestinian uprising of the 2000s, but such attacks are now rare. No injuries were reported.
Israeli police said five bombs were identical and equipped with timers, and said bomb squads were defusing the unexploded bombs.
Investigators in white coveralls searched for evidence inside the burned-out metal shells of the buses, which blew up in a parking lot in Bat Yam, a city outside Tel Aviv.
Tzvika Brot, the city's mayor, said it was a miracle no one was hurt. The buses had been parked after finishing their routes, he said.
The head of the bus company said they immediately ordered all bus drivers to stop and conduct a "thorough inspection."
They resumed their routes once they were found to be safe, Ofir Karni said.
Israeli Prime Minister Benjamin Netanyahu's office said he was receiving updates from his military secretary following the events.
The Shin Bet internal security agency was taking over the investigation, police said.
"We need to determine if a single suspect placed explosives on a number of buses, or if there were multiple suspects," police spokesman Haim Sargrof told Israeli TV.
Sargrof said the explosives used on Thursday matched explosives used in the West Bank, but he declined to elaborate.
Israel's military has repeatedly carried out raids on suspected Palestinian militants in the West Bank since Hamas' October 7, 2023, attack sparked the devastating war in Gaza.
As part of that crackdown, Israel has greatly restricted entry into Israel for Palestinians from the occupied territory.
A group identifying itself as a branch of Hamas' military wing, the Qassam Brigades, from the northern West Bank city of Tulkarem, posted on the messaging app Telegram: "We will never forget to take vengeance for our martyrs as long as the occupation is on our lands."
The group did not claim responsibility for the attack.
Tulkarem and two refugee camps in the city have been a focus of Israel's broad military offensive in the West Bank, since the ceasefire in Gaza took effect on January 19.
In the past, militants have entered Israel and carried out shootings and bombings in Israeli cities.
Brot, the mayor of Bat Yam, urged residents to stick with their routines but also stay vigilant, telling Channel 13 TV that schools will be open Friday and public transport will be operating.
