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As part of the cease-fire agreement, Syria‘s military was to have pulled tanks and troops off the streets, but it instead has continued to raid and attack opposition strongholds.

In London, British Foreign Secretary William Hague warned that “there is a limit to the patience of the international community” with the regime’s continued truce violations.

However, Western powers have limited options because Russia and China, Syria‘s allies, have shielded Mr. Assad from U.N. Security Council action. Mr. Hague said that more truce monitors must be sent to Syria to improve the situation and that Britain is increasing its nonlethal support for the opposition.

Currently, 16 observers are on the ground. By mid-May, the team is to grow to 100, but U.N. officials have not said by when a full 300-member contingent is to be deployed.

Associated Press writer Albert Aji in Damascus and Zeina Karam in Beirut contributed to this article.