Detectives examine explosive parts found at scene
A SIM card and samples of explosives found at the blast scenes on the Thika Superhighway are key in establishing the identity and motive of the attackers.
Investigations had been launched into the two attacks that claimed three lives and left about 80 others injured, Inspector-General of Police David Kimaiyo said on Monday.
Detectives collected a SIM card from one of the blast scenes. They also collected parts of the improvised explosives from the two blast scenes.
They are seeking to establish whether the SIM card was registered and to whom, among other details.
ByMonday evening, police had not disclosed the mobile service provider for the SIM card.
“We are liaising with service providers to find out if there were calls made using the card or if any call had been received through it,” said an officer who sought anonymity.
Also being analysed are parts of the explosives retrieved.
According to the police, the devices had powerful detonators and were packed with ball bearings, among other objects, to cause extensive damage.
Investigators are also trying to establish whether the explosions were triggered through a remote-controlled device or a mobile phone signal.
Some witnesses have recorded statements with the police, describing two suspects said to have alighted from a Mwi Sacco bus just before it left town.
On Monday, Canada condemned the weekend attacks. Foreign Affairs minister John Baird said Canada supports the Kenyan Government in the fight against terror.