Angry voters who are upset with MPs absent during the vote on the Prevention of Terrorism Act (Pota) should write in and voice their discontent, PKR vice-president Rafizi Ramli said.

"I suggest the angry public write personally to the MP who didn't attend to deliver the message.

"Perhaps it won't repeat the next time," Rafizi ( left ) said in a Twitter posting.

The Parliament debate on Pota dragged into the wee hours of April 7 as Pakatan MPs attempted to delay the bill which reintroduces detention without trial.

Despite their efforts, the bill was passed at 2.25am. More than 20 Pakatan MPs were absent.

Even though more MPs were absent from the BN side, their superior numbers allowed them to push the bill through.

From DAP, the names of Lim Kit Siang (Gelang Patah), Lim Guan Eng (Bagan) and Liew Chin Tong (Kluang) were absent from the Parliament Hansard throughout the day.

However, DAP national organising chairperson Anthony Loke said the official absentees were only two as Kit Siang was present until 10pm but had to leave as he felt unwell.

"Lim was around from 7.30pm to 10pm. He was around for the earlier reading but he wasn't there for the last reading because he was unwell," said Loke, who is also the DAP whip.

He added that Liew and Guan Eng were absent as they had prior arrangements in Australia.

As for PKR, among those absent were party whip Johari Abdul (Sungai Petani), R Sivarasa (Subang) and Michael Teo (Miri) while the names of Fuziah Salleh (Kuantan), Fauzi Abdul Rahman (Indera Mahkota), Azmin Ali (Gombak), Kamarul Baharin Abbas (Telok Kemang) were also missing from the Hansard.

Bulk of the absentees came from PAS

However, the bulk of the absentees, at more than 10, came from PAS including its president Abdul Hadi Awang.

Some PAS MPs who were present earlier in the day, such as party whip Mahfuz Omar (Pokok Sena), were absent when the vote came up after 2am.

If an MP's name is not in the Hansard, it means he or she is either absent or did not utter a single word throughout the sitting.

The Hansard can be downloaded here .