Somerset reduced Middlesex to 18-3 after they were bowled out for 236 on day one of their must-win County Championship Division One clash.
England bowler Toby Roland-Jones has suffered a stress fracture in his lower
back and will miss the rest of the domestic season.
Steve Finn swelled Middlesex's hopes of avoiding relegation by taking 8-79 in a 36-run win over Lancashire at Lord's.
Rory Kleinveldt bagged 9-65 for Northants in the Championship, while Surrey's Kumar Sangakkara scored yet another century.
England seamer Toby Roland-Jones was unable to take the field in Middlesex's County Championship clash against Lancashire.
Rikki Clarke took a career-best 7-55 but Somerset still managed to score 269 against Surrey thanks to Steven Davies' 86.
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Warwickshire were relegated to County Championship Division Two as Somerset beat Lancashire to boost their own survival bid
Somerset are closing in on a crucial victory in their fight for County Championship Division One survival.
Essex are closing in on the Specsavers County Championship title with Lancashire struggling against Somerset at Taunton.
Essex edged closer to the County Championship title after making a strong start to their match against Warwickshire at Edgbaston.
Chris Read's final game for Nottinghamshire at Trent Bridge ended in defeat, while Warwickshire edged closer to relegation.
Haseeb Hameed missed out on a first Championship hundred of 2017, while Notts' unbeaten run is in jeopardy at Trent Bridge.
Haseeb Hameed's 85no bolstered Lancashire on day two of their Specsavers County Championship clash with title rivals Essex.
Ben Duckett creamed 193 for Northants in the County Championship but rain blighted much of day one elsewhere.
Steven Finn has committed his future to Middlesex by signing a new multi-year contract with the county.
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A 35-year-old man has been arrested after a crossbow bolt was fired on to the pitch at the Kia Oval.
Police are appealing for anyone who may have footage of a crossbow bolt landing at The Oval on Thursday to contact them.
Play between Middlesex and Surrey was abandoned on Thursday after a metal-tipped crossbow bolt was fired onto the pitch.
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