Sayed Abbas, 19, was with two friends when he was wounded
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Two more teenagers have been charged with the murder of a 19-year-old at an underground station in west London.
Sayed Abbas died after being stabbed on the platform of Hounslow West station after 2300 BST on Thursday.
Hassan Hassan, 18, and a 17-year-old male are due to appear at Feltham Magistrates' Court on Monday. They were charged on Saturday evening.
Two others, Oluwasey Ogunsanya, 19, and a 16-year-old male, are also due to appear at the court on Monday.
They were charged earlier on Saturday.
Both the 16-year-old and the 17-year-old cannot be named for legal reasons.
Mr Abbas was with two friends when he was wounded.
A train driver went to his assistance, but Mr Abbas died after arriving at West Middlesex hospital.
The Tube station was sealed off by police following the attack, causing delays for thousands of holidaymakers heading to Heathrow.
A fifth person is being questioned by police over the death.