POLICE HOLDING 10 IN LONDON BLASTS
By Alvin Shuster Special to The New York Times
terrorists who set off Mar 8 two large explosions in central London, Eng, are described on Mar 9 as members of special squad sent to London within last 10 days by militant Provisional wing of IRA; as police continue questioning 7 men and 3 women detained at Heathrow, London's airport, on Mar 8, sources within Provisional ranks tell reporters in Belfast, N Ireland, that 8 members of squad returned safely to N Ireland; bomb explosions killed 1 man and injured more than 200; Comdr R Huntley, who is leading search for terrorists, says some explosives might have come over from N Ireland in stolen car parked in front of Old Bailey, Central Criminal Ct; says Scotland Yard still lacks conclusive evidence linking Provisional wing with explosions; Provisional sources say 2 of women detained in London are sisters, D and M Price, whose father was prominent in earlier IRA campaigns; officials in London believe explosions were timed to coincide with Mar 8 referendum in N Ireland on whether province should remain under Brit control; Brit Prime Min Heath meets with Home Sec R Carr, who has jurisdiction over police; continues talks with Irish Prime Min-elect L Cosgrave and B Corish, his deputy; is joined by Defense Min Lord Carrington; Cosgrave is believed to have been told in detail of Brit Govt's thinking about constitutional future of N Ireland, to be set out in white paper that is expected soon