British police arrested a dozen people Sunday in a widening terrorism investigation after attackers

LONDON (AP) — British police arrested a dozen people Sunday in a widening terrorism investigation after attackers using a van and large knives turned a balmy evening of nightlife into a bloodbath and killed seven people in the heart of London. The Islamic State group claimed responsibility.

Although the attackers were also dead, authorities raced to determine whether they had accomplices, and Prime Minister Theresa May warned that the country faced a new threat from copycat attacks.
copycat：まねをした，模倣の.
a copycat crime 模倣犯罪

van　 バン、ワゴン車
ram into pedestrians　 歩行者らに突っ込む
end with　 ～で終わる
stabbing　 刺すこと、刺傷事件
nearby　　　　近くの
suspect　　　　容疑者
(be) shot dead　　　　射殺される