Giving a virtual ultimatum to the government, Samajwadi Party on Wednesday said if no 'action' is taken against Pakistan within five days, it would have to review its support.

Complaining that the ruling UPA was treating it like an 'outsider' on the issue of dealing with Pakistan, the SP said it was under 'tremendous pressure' from its cadres as the government was not doing anything against the neighbouring country despite the Mumbai attacks.

The party, which is extending crucial outside support to the Congress-led government, said its parliamentary board meeting in New Delhi [Images] on Wednesday was of the view that India needed to take strong action against Pakistan.

"The meeting criticised the government for failing to take any concrete action against Pakistan in the aftermath of the Mumbai terror attacks [Images]," SP general secretary Amar Singh [Images] told a press conference along with party chief Mulayam Singh Yadav [Images] after over a two-hour meeting.

"In this light, we have decided to give it five days' time to take action against Pakistan, otherwise we will review our support to the government in a working committee meeting of our party, which would be called after January 14," he said.

The party's virtual ultimatum came a day after Singh issued a similar threat of withdrawal of support, only to tone it down after meeting Congress President Sonia Gandhi [Images] a few hours later.