"The Prime Minister called the opposition leader at her official phone at 1:15 pm (local time) but nobody picked it for half an hour," Abul Kalam Azad, press secretary to the premier, told reporters here.
Hasina's special assistant Mahbubul Haque Shakil said the premier tried to reach Zia from 1:15 pm to 1:45 pm but no one responded to her phone call.
BNP's acting secretary general Mirza Fakhrul Islam Alamgir told reporters that Zia's official phone "is out of order for a long time" and all her lines "remain out of order most of the times."
An official said a personal aide of Hasina also called the BNP chief's special assistant, Shamsur Rahman Shimul Biswas.
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"He (Biswas) was told that the Prime Minister is scheduled to attend a meeting of the Awami League's parliamentary party at 6pm. The Leader of the Opposition can call her back by 6pm, if she wants to," the official said.
Zia has threatened to launch a 60-hour nationwide shutdown from tomorrow if her demands are not met. Hasina has proposed the formation of a caretaker government with representatives of all political parties, but this was rejected by Zia.
The violence continued today as suspected opposition activists blasted seven crude bombs in front of the houses of a Supreme Court judge, the environment minister and a police office. A bus and a private car was set ablaze.