CITY NOW IN CHAOS
By Fox Butterfield Special to The New York Times
N Vietnamese troops closing in on Danang seize Hoi An, 15 miles away, as Danang and its principal airport are shelled; N Vietnamese troops capture Bao Loc, capital of Lam Dong Prov; troops and civilians reptdly have fled; Danang is reptd to be in chaos as city, swollen with 500,000 refugees, suspends air evacuation efforts as thousands swarm over its 2 airfields; Govt troops are commanded to restore order in 48 hrs and to shoot violators on sight; N Vietnamese troops are continuing advance along central coastal plain; Govt troops repulse N Vietnamese assault on Chon Thanh, on northern boundary of Saigon; S Vietnamese sources estimate Govt forces have abandoned more than $1-billion in Amer equipment during rapid and chaotic retreat during last 2 wks; US Consul Gen Albert Francis leaves Danang in Air Amer helicopter; searches are continuing for Amers in city; more than 300 Amers, including about 80 officials, have been evacuated in last 2 days; Gen Weyand met with Pres Thieu, Mar 28, to discuss deteriorating mil situation; was accompanied by Amb Martin; US officials say 9,000 to 10,000 refugees have been evacuated from Danang aboard Pioneer Contender, Defense Dept-chartered cargo vessel; refugees are to be taken to Cam Ranh Bay; scene at airport as refugees desperately attempt to board evacuation planes described; officials say some refugees had to be sprayed with Mace to clear path for departing World Airways plane; intelligence repts indicate N Vietnamese are planning major push on capital from Tay Ninh; casualty repts noted; illus; map (L)