NortonLife Lock Avast . delayed completion of the deal for

US cyber security firm NortonLifeLock Inc on Thursday delayed to April 4 the expected completion date for its purchase of London-listed rival Avast Plc, saying it was awaiting regulatory approvals in the United Kingdom and Spain.

The cash and stock deal, worth up to $8.6 billion when it was first announced in August last year, was previously expected to close on February 24.

Shares of NortonLifeLock were down 2.1% in extended trading.

The acquisition has attracted scrutiny from Britain’s competition regulator and the agency launched an investigation in January into whether the deal would reduce options for customers in the country.

The regulator has set March 16 as the deadline for a preliminary decision.

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