Four more Palestinians killed, toll in Gaza 639

At least four more people were killed Wednesday in Gaza, where 635 Palestinians and 29 Israelis have already been killed during Israel's two-week air, naval and ground offensive.

Palestinian officials said that two men were killed in the southern of Bei Lahiya, and a 17-year-old teenager was killed in Khanyounis Ccity, south of Gaza, Xinhua reported.

Another Palestinian man dieed of his injuries in Khanyonis.

Earlier Wednesday, US Secretary of State John Kerry discussed on phone with Palestinian President Mahmoud Abbas about the possibility to reach a ceasefire deal to end the fighting in Gaza between Israel and militants of Islamic Hamas Movement.

Earlier Tuesday, UN Secretary General Ban Ki-moon, who was on a visit to the West Bank Palestinian city of Ramallah and Israel, urged the warring sides to stop fighting and start talks on a ceasefire.

All regional and international efforts to broker a ceasefire in Gaza have failed so far.

At least 635 Palestinians have been killed and over 4,000 others injured since Israel started to attack Gaza July 8 in response to Palestinian rocket firing into its territory.

One Israeli civilian and 28 soldiers were also killed during the ongoing offensive.