"China urges the concerned sides, especially Israel, to take tangible measures to ensure the security of UN peacekeepers," said Foreign Ministry spokesman Liu Jianchao on Wednesday.

"We feel deep sorrow for the victims and convey sincere condolences to their families," Liu said.

Chinese Assistant Foreign Minister Zhai Jun called in Israeli Ambassador Yehoyada Haim Wednesday morning and made solemn representations.

"China strongly condemns the activity to raid the UN peacekeeping post and urge Israel to carry out thorough investigation and apologize to China and the victim's families and coordinate with China to deal with the aftermath," Zhao told the ambassador.

Yehoyada Haim expressed the Israeli government's apology for the event, pledging to carry out broad and in-depth investigation to find the truth at an early date.

Chinese Ambassador to the UN Wang Guangya on Wednesday made an emergency call to UN Deputy Secretary-General Mark Malloch Brown, asking the UN to require Israel to take every measure to ensure the security of UN peacekeepers, including those from China, and investigate the event.

The Chinese victim Du Zhaoyu was among the four UN peacekeepers killed in the Israeli air strike Tuesday night.