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JERUSALEM (AP) _ An explosion rocked a market in the coastal city of Netanya on Sunday, injuring at least 20 people, rescue services said.

Israel radio said security forces were on alert in the area of Netanya in central Israel for several hours after information was received that a suicide bomber was preparing an attack.

At least 20 people were injured in the blast, said Avi Zohar, a spokesman for Magen David Adom, Israel's rescue service.

It was not clear if anyone was seriously injured.

Netanya, which is close to the West Bank, has been frequently targeted by Palestinian militants. In March, an attack in Netanya killed 29 people at a Passover seder, sparking Israel's recently concluded five-week offensive in the West Bank.