Policemen use dogs to check the venue of the Asia-Pacific Economic Cooperation (APEC) Leaders' Meeting in Manila, Philippines, on Nov. 14, 2015. Security measures in Manila, especially around the Asia-Pacific Economic Cooperation (APEC) Leaders' Meeting venues, were tightened on Saturday following terror attacks in Paris that killed at least 153 people. (Xinhua/Li Peng)

Staff members work at the venue of the Asia-Pacific Economic Cooperation (APEC) Leaders' Meeting in Manila, Philippines, on Nov. 14, 2015. Security measures in Manila, especially around the Asia-Pacific Economic Cooperation (APEC) Leaders' Meeting venues, were tightened on Saturday following terror attacks in Paris that killed at least 153 people. (Xinhua/Lui Siu Wai)

A policeman uses a dog to check the venue of the Asia-Pacific Economic Cooperation (APEC) Leaders' Meeting in Manila, Philippines, on Nov. 14, 2015. Security measures in Manila, especially around the Asia-Pacific Economic Cooperation (APEC) Leaders' Meeting venues, were tightened on Saturday following terror attacks in Paris that killed at least 153 people. (Xinhua/Li Peng)

Policemen use dogs to check the venue of the Asia-Pacific Economic Cooperation (APEC) Leaders' Meeting in Manila, Philippines, on Nov. 14, 2015. Security measures in Manila, especially around the Asia-Pacific Economic Cooperation (APEC) Leaders' Meeting venues, were tightened on Saturday following terror attacks in Paris that killed at least 153 people. (Xinhua/Lui Siu Wai)

Security officials frisk media members at the entrance of the media center of the Asia-Pacific Economic Cooperation (APEC) Leaders' Meeting in Manila, Philippines, on Nov. 14, 2015. Security measures in Manila, especially around the Asia-Pacific Economic Cooperation (APEC) Leaders' Meeting venues, were tightened on Saturday following terror attacks in Paris that killed at least 153 people. (Xinhua/Li Peng)

A member of staff works at the venue of the Asia-Pacific Economic Cooperation (APEC) Leaders' Meeting in Manila, Philippines, on Nov. 14, 2015. Security measures in Manila, especially around the Asia-Pacific Economic Cooperation (APEC) Leaders' Meeting venues, were tightened on Saturday following terror attacks in Paris that killed at least 153 people. (Xinhua/Lui Siu Wai)

Policemen have meal near the venue of the Asia-Pacific Economic Cooperation (APEC) Leaders' Meeting in Manila, Philippines, on Nov. 14, 2015. Security measures in Manila, especially around the Asia-Pacific Economic Cooperation (APEC) Leaders' Meeting venues, were tightened on Saturday following terror attacks in Paris that killed at least 153 people. (Xinhua/Li Peng)

Special policemen patrol near the venue of the Asia-Pacific Economic Cooperation (APEC) Leaders' Meeting in Manila, Philippines, on Nov. 14, 2015. Security measures in Manila, especially around the Asia-Pacific Economic Cooperation (APEC) Leaders' Meeting venues, were tightened on Saturday following terror attacks in Paris that killed at least 153 people. (Xinhua/Lui Siu Wai)