The man who shot Tunisian opposition figure Chokri Belaid fled on a motorcycle ridden by an accomplice, authorities said.
"A man opened fire on Chokri Belaid and then fled with a second person who was waiting on a motorcycle," said interior ministry spokesman Khaled Tarouch.
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A 24-year-old man has been arrested on suspicion of murder after the body washed up on the Thames shoreline.
Police were called to an address in Carlisle on Friday night but the eight-month-old died later in hospital.
Jamie Vardy scored for a record-breaking eleventh game in a row as Leicester were held 1-1 at home to Manchester United