The Disaster Management Authority has advised people not to venture out between 11 am and 3 pm, avoid getting exposed to direct sun and drink water at regular intervals to avoid dehydration.
All the five are suspected to be part of a gold-smuggling gang based in Malappuram, the police said.
Ponnani native Fahadh, who is suspected to have participated in the abduction, was arrested in the wee hours of Friday. The police have also seizeed the car used for the crime.
Gathering of more than five people for any event other than funerals were banned in these taluks till Saturday, the district administration announced on Thursday.
The deceased has been identified as 22-year-old Nandu Krishna. Six others were also injured. BJP is observing a dawn-to-dusk (6am to 6pm) hartal in the district to protest the violence.
Bindu, a native of Kurattikkad near Mannar, who returned from Gulf four days ago, was allegedly used to smuggle 1.5 kilograms of gold, according to the police.
The National Human Rights Commission said it has also asked the Kerala government to register a criminal case in the matter and pay Rs 5 lakh as relief to the next of kin of the deceased.
The woman was allegedly abducted from her house in Alappuzha's Mannar by an unidentified gang in the wee hours of Monday only to be abandoned by the wayside in Vadakkancherry in northern Palakkad.
KR Gouri, who now serves as the party president, expelled general secretary Rajan Babu for alleged anti-organisational activities. The decision to leave the LDF was apparently taken without her consent.
The woman named Bindu (32) had returned from the Middle East only four days ago. The abduction happened at Kurattikkad locality on the intervening night of Sunday and Monday.