At least 22 people have been injured in the explosion on a bus in Israel's commercial capital, Tel Aviv, in what one Israeli official described as a "terrorist attack".

Hamas praised the attack, but did not claim responsibility.

he bus attack happened Wednesday in a typically quiet neighborhood of Tel Aviv.

Two people, speaking live on Israeli radio, said they saw a man throw a bag into the bus and then run away after the explosion.

Terrorists planted at least two bombs on the bus and fled, Israeli police spokesman Micky Rosenfeld said.

Rosenfeld said three of the victims were seriously wounded. Aviva Shemer with Ichilov Hospital said 22 people went to the hospital after the explosion, including some pedestrians.

One victim was in serious condition with shoulder injuries, while two others suffered moderate injuries from glass fragments.

After the incident, near a military headquarters, huge blasts were heard in Gaza - an apparent Israeli strike on the football stadium.

Eleven people were killed in Gaza on Wednesday, the health ministry said.

Efforts to broker a truce between the Hamas movement and Israel continue.

The blast in Tel Aviv shook up the public and drew immediate condemnation from world leaders, including U.N. Secretary-General Ban Ki-moon, who called the attack "shocking" in a statement released by his office.

After eight days of exchanges of fire between Israel and Palestinian militants in Gaza, US Secretary of State Hillary Clinton is now in Cairo for talks with the Egyptian president.

Clinton said the United States "stands ready to provide any assistance that Israel requires."

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