What you need to know:
Mr Ng’etich said that upon interrogation, it was discovered the four had flown to Wajir from Nairobi in Jetways plane.
A taxi driver who drove the suspects to the venue is also in police custody and helping with the investigation.
Police have arrested a man suspected to have lobbed teargas canister at a crowd during the Inua Mama rally in Wajir County on Friday.
The several people sustained minor injuries as the teargas canister went off near the dais at Qorahay grounds.
Wajir County Police Commander Stephen Ng'etich said the suspect, who hails from Kibera, Nairobi, was arrested as he tried to flee during the chaos.
“We arrested a man believed to have lobbed the teargas canister at the crowd during Inua Mama event as he tried to escape,” said Mr Ng'etich.
Mr Ng'etich said the police are pursuing three other suspects in relation to the incident.
He said that upon interrogation, it was discovered four suspects had flown to Wajir from Nairobi in a Jetways plane.
He added that a taxi driver is also in police custody and is helping with investigations.
The incident attracted harsh criticism from a section of women legislators who vowed to pursue justice and ensure the perpetrators are brought to book.